<!--
============================================
The Octet Molecular Representation Framework
============================================

Project Info:  http://octet.sourceforge.net

Copyright (C) 2005 Richard L. Apodaca

This library is free software; you can redistribute it and/or modify it under the terms
of the GNU Lesser General Public License version 2.1 as published by the Free Software
Foundation.

This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with this
library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
Boston, MA 02111-1307, USA.
-->

<!--
This system of atomic masses is quoted from:

de Laeter, J.R.; Boehlke, J.K.; de Bievre, P.; Hidaka, H.; Peiser, H.S.; Rosman, K.J.R.;
Taylor, P.D.P. Atomic Weights of the Elements: Review 2000 (IUPAC Technical Report)
Pure Appl. Chem. 2003, 75, 683-800.

http://www.iupac.org/publications/pac/2003/7506/7506x0683.html
-->
<atomic-mass-table mass-units="u" abundance-units="Mole Fraction">
  
  <entry symbol="H" atomic-number="1">
    <natural-abundance>
      <mass value="1.00794" error="0.00007" />
      <isotope mass-number="1">
        <mass value="1.0078250319" error="0.00000000006" />
        <abundance value="0.999885" error="0.000070" />
      </isotope>
      <isotope mass-number="2">
        <mass value="2.0141017779" error="0.0000000006" />
        <abundance value="0.000115" error="0.000070" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="He" atomic-number="2">
    <natural-abundance>
      <mass value="4.002602" error="0.000002" />
      <isotope mass-number="3">
        <mass value="3.0160293094" error="0.0000000012" />
        <abundance value="0.00000134" error="0.00000003" />
      </isotope>
      <isotope mass-number="4">
        <mass value="4.0026032497" error="0.0000000015" />
        <abundance value="0.99999866" error="0.00000003" />
      </isotope>
    </natural-abundance>
  </entry>

  <entry symbol="Li" atomic-number="3">
    <natural-abundance>
      <mass value="6.9421" error="0.002" />
      <isotope mass-number="3">
        <mass value="6.0151223" error="0.0000005" />
        <abundance value="0.0759" error="0.0004" />
      </isotope>
      <isotope mass-number="7">
        <mass value="7.0160041" error="0.0000005" />
        <abundance value="0.9241" error="0.0004" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Be" atomic-number="4">
    <natural-abundance>
      <mass value="9.012182" error="0.000003" />
      <isotope mass-number="9">
        <mass value="9.0121822" error="0.0000004" />
        <abundance value="1" error="0" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="B" atomic-number="5">
    <natural-abundance>
      <mass value="10.881" error="0.007" />
      <isotope mass-number="10">
        <mass value="10.0129371" error="0.0000003" />
        <abundance value="0.199" error="0.007" />
      </isotope>
      <isotope mass-number="11">
        <mass value="11.0093055" error="0.0000004" />
        <abundance value="0.801" error="0.007" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="C" atomic-number="6">
    <natural-abundance>
      <mass value="12.0107" error="0.0008" />
      <isotope mass-number="12">
        <mass value="12" error="0" />
        <abundance value="0.9893" error="0.0008" />
      </isotope>
      <isotope mass-number="13">
        <mass value="13.003354838" error="0.000000005" />
        <abundance value="0.0107" error="0.0008" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="N" atomic-number="7">
    <natural-abundance>
      <mass value="14.0067" error="0.0002" />
      <isotope mass-number="14">
        <mass value="14.0030740074" error="0.0000000018" />
        <abundance value="0.99636" error="0.00020" />
      </isotope>
      <isotope mass-number="15">
        <mass value="15.000108973" error="0.000000012" />
        <abundance value="0.00364" error="0.00020" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="O" atomic-number="8">
    <natural-abundance>
      <mass value="15.9994" error="0.0003" />
      <isotope mass-number="16">
        <mass value="15.9949146223" error="0.0000000025" />
        <abundance value="0.99759" error="0.00016" />
      </isotope>
      <isotope mass-number="17">
        <mass value="16.99913150" error="0.00000022" />
        <abundance value="0.00038" error="0.00001" />
      </isotope>
      <isotope mass-number="18">
        <mass value="17.9991604" error="0.0000009" />
        <abundance value="0.00205" error="0.00014" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="F" atomic-number="9">
    <natural-abundance>
      <mass value="18.9984032" error="0.0000005" />
      <isotope mass-number="19">
        <mass value="18.99840320" error="0.00000007" />
        <abundance value="1" error="0" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Ne" atomic-number="10">
    <natural-abundance>
      <mass value="20.1797" error="0.0006" />
      <isotope mass-number="20">
        <mass value="19.992440176" error="0.000000003" />
        <abundance value="0.9048" error="0.0003" />
      </isotope>
      <isotope mass-number="21">
        <mass value="20.99384674" error="0.00000004" />
        <abundance value="0.0027" error="0.0001" />
      </isotope>
      <isotope mass-number="22">
        <mass value="21.99138550" error="0.00000025" />
        <abundance value="0.0925" error="0.0003" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Na" atomic-number="11">
    <natural-abundance>
      <mass value="22.989770" error="0.000002" />
      <isotope mass-number="23">
        <mass value="22.98976966" error="0.00000026" />
        <abundance value="1" error="0" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Mg" atomic-number="12">
    <natural-abundance>
      <mass value="24.3050" error="0.0006" />
      <isotope mass-number="24">
        <mass value="23.98504187" error="0.00000026" />
        <abundance value="0.7899" error="0.0004" />
      </isotope>
      <isotope mass-number="25">
        <mass value="24.98583700" error="0.00000026" />
        <abundance value="0.1000" error="0.0001" />
      </isotope>
      <isotope mass-number="26">
        <mass value="25.98259300" error="0.00000026" />
        <abundance value="0.1101" error="0.0003" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Al" atomic-number="13">
    <natural-abundance>
      <mass value="26.981538" error="0.000002" />
      <isotope mass-number="27">
        <mass value="26.98153841" error="0.00000024" />
        <abundance value="1" error="0" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Si" atomic-number="14">
    <natural-abundance>
      <mass value="28.0855" error="0.0003" />
      <isotope mass-number="28">
        <mass value="27.97692649" error="0.00000022" />
        <abundance value="0.92223" error="0.00019" />
      </isotope>
      <isotope mass-number="29">
        <mass value="28.97649468" error="0.00000022" />
        <abundance value="0.04685" error="0.00008" />
      </isotope>
      <isotope mass-number="30">
        <mass value="29.97377018" error="0.00000022" />
        <abundance value="0.03092" error="0.00011" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="P" atomic-number="15">
    <natural-abundance>
      <mass value="30.973761" error="0.000002" />
      <isotope mass-number="31">
        <mass value="30.97376149" error="0.00000027" />
        <abundance value="1" error="0" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="S" atomic-number="16">
    <natural-abundance>
      <mass value="32.065" error="0.005" />
      <isotope mass-number="32">
        <mass value="31.97207073" error="0.00000015" />
        <abundance value="0.9499" error="0.0026" />
      </isotope>
      <isotope mass-number="33">
        <mass value="32.97145854" error="0.00000015" />
        <abundance value="0.0075" error="0.0002" />
      </isotope>
      <isotope mass-number="34">
        <mass value="33.96786687" error="0.00000014" />
        <abundance value="0.0425" error="0.0024" />
      </isotope>
      <isotope mass-number="36">
        <mass value="35.96708088" error="0.00000025" />
        <abundance value="0.0001" error="0.0001" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Cl" atomic-number="17">
    <natural-abundance>
      <mass value="35.453" error="0.002" />
      <isotope mass-number="35">
        <mass value="34.96885271" error="0.00000004" />
        <abundance value="0.7576" error="0.0010" />
      </isotope>
      <isotope mass-number="37">
        <mass value="36.96590260" error="0.00000005" />
        <abundance value="0.2424" error="0.0010" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Ar" atomic-number="18">
    <natural-abundance>
      <mass value="39.948" error="0.001" />
      <isotope mass-number="36">
        <mass value="35.96754626" error="0.00000027" />
        <abundance value="0.0003365" error="0.000030" />
      </isotope>
      <isotope mass-number="38">
        <mass value="37.9627322" error="0.0000005" />
        <abundance value="0.000632" error="0.000005" />
      </isotope>
      <isotope mass-number="40">
        <mass value="39.962383124" error="0.000000005" />
        <abundance value="0.996003" error="0.000030" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="K" atomic-number="19">
    <natural-abundance>
      <mass value="39.0983" error="0.0001" />
      <isotope mass-number="39">
        <mass value="38.9637069" error="0.0000003" />
        <abundance value="0.932581" error="0.000044" />
      </isotope>
      <isotope mass-number="40">
        <mass value="39.96399867" error="0.00000029" />
        <abundance value="0.000117" error="0.000001" />
      </isotope>
      <isotope mass-number="41">
        <mass value="40.96182597" error="0.00000028" />
        <abundance value="0.067302" error="0.000044" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Ca" atomic-number="20">
    <natural-abundance>
      <mass value="40.078" error="0.004" />
      <isotope mass-number="40">
        <mass value="39.9625912" error="0.0000003" />
        <abundance value="0.96941" error="0.00156" />
      </isotope>
      <isotope mass-number="42">
        <mass value="41.9586183" error="0.0000004" />
        <abundance value="0.00647" error="0.00023" />
      </isotope>
      <isotope mass-number="43">
        <mass value="42.9587668" error="0.0000005" />
        <abundance value="0.00135" error="0.00010" />
      </isotope>
      <isotope mass-number="44">
        <mass value="43.9554811" error="0.0000009" />
        <abundance value="0.02086" error="0.00110" />
      </isotope>
      <isotope mass-number="46">
        <mass value="45.9536927" error="0.0000025" />
        <abundance value="0.00004" error="0.00003" />
      </isotope>
      <isotope mass-number="48">
        <mass value="47.952533" error="0.000004" />
        <abundance value="0.00187" error="0.00021" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Sc" atomic-number="21">
    <natural-abundance>
      <mass value="44.955910" error="0.000008" />
      <isotope mass-number="45">
        <mass value="44.9559102" error="0.0000012" />
        <abundance value="1" error="0" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Ti" atomic-number="22">
    <natural-abundance>
      <mass value="47.867" error="0.001" />
      <isotope mass-number="46">
        <mass value="45.9526295" error="0.0000012" />
        <abundance value="0.0825" error="0.0003" />
      </isotope>
      <isotope mass-number="47">
        <mass value="46.9517637" error="0.0000010" />
        <abundance value="0.0744" error="0.0002" />
      </isotope>
      <isotope mass-number="48">
        <mass value="47.9479470" error="0.0000010" />
        <abundance value="0.7372" error="0.0003" />
      </isotope>
      <isotope mass-number="49">
        <mass value="48.9478707" error="0.0000010" />
        <abundance value="0.0541" error="0.0002" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="V" atomic-number="23">
    <natural-abundance>
      <mass value="50.9415" error="0.0001" />
      <isotope mass-number="50">
        <mass value="49.9471627" error="0.0000014" />
        <abundance value="0.00250" error="0.00004" />
      </isotope>
      <isotope mass-number="51">
        <mass value="50.9439635" error="0.0000014" />
        <abundance value="0.99750" error="0.00004" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Cr" atomic-number="24">
    <natural-abundance>
      <mass value="51.9961" error="0.0006" />
      <isotope mass-number="50">
        <mass value="49.9460495" error="0.0000014" />
        <abundance value="0.04345" error="0.00013" />
      </isotope>
      <isotope mass-number="52">
        <mass value="51.9405115" error="0.0000015" />
        <abundance value="0.83789" error="0.00018" />
      </isotope>
      <isotope mass-number="53">
        <mass value="52.9406534" error="0.0000015" />
        <abundance value="0.09501" error="0.00017" />
      </isotope>
      <isotope mass-number="54">
        <mass value="53.938846" error="0.0000015" />
        <abundance value="0.02365" error="0.00007" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Mn" atomic-number="25">
    <natural-abundance>
      <mass value="54.938049" error="0.000009" />
      <isotope mass-number="55">
        <mass value="54.9380493" error="0.0000015" />
        <abundance value="1" error="0" />
      </isotope>
    </natural-abundance>
  </entry>

  <entry symbol="Fe" atomic-number="26">
    <natural-abundance>
      <mass value="55.845" error="0.002" />
      <isotope mass-number="54">
        <mass value="53.9396147" error="0.0000014" />
        <abundance value="0.05845" error="0.00035" />
      </isotope>
      <isotope mass-number="56">
        <mass value="55.9349418" error="0.0000015" />
        <abundance value="0.91754" error="0.00036" />
      </isotope>
      <isotope mass-number="57">
        <mass value="56.9353983" error="0.0000015" />
        <abundance value="0.02119" error="0.00010" />
      </isotope>
      <isotope mass-number="58">
        <mass value="57.9332801" error="0.0000015" />
        <abundance value="0.00282" error="0.00004" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Co" atomic-number="27">
    <natural-abundance>
      <mass value="58.933200" error="0.000009" />
      <isotope mass-number="59">
        <mass value="59.9331999" error="0.0000015" />
        <abundance value="1" error="0" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Ni" atomic-number="28">
    <natural-abundance>
      <mass value="58.6934" error="0.0002" />
      <isotope mass-number="58">
        <mass value="57.9353477" error="0.0000016" />
        <abundance value="0.680769" error="0.000089" />
      </isotope>
      <isotope mass-number="60">
        <mass value="59.9307903" error="0.0000015" />
        <abundance value="0.262231" error="0.000077" />
      </isotope>
      <isotope mass-number="61">
        <mass value="60.9310601" error="0.0000015" />
        <abundance value="0.011399" error="0.000006" />
      </isotope>
      <isotope mass-number="62">
        <mass value="61.9283484" error="0.0000015" />
        <abundance value="0.0036345" error="0.000017" />
      </isotope>
      <isotope mass-number="64">
        <mass value="63.9279692" error="0.0000016" />
        <abundance value="0.009256" error="0.000009" />
      </isotope>
    </natural-abundance>
  </entry>

  <entry symbol="Cu" atomic-number="29">
    <natural-abundance>
      <mass value="63.546" error="0.003" />
      <isotope mass-number="63">
        <mass value="62.9296007" error="0.0000015" />
        <abundance value="0.6915" error="0.0015" />
      </isotope>
      <isotope mass-number="65">
        <mass value="64.9277938" error="0.0000019" />
        <abundance value="0.3085" error="0.0015" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Zn" atomic-number="30">
    <natural-abundance>
      <mass value="65.409" error="0.004" />
      <isotope mass-number="64">
        <mass value="63.9291461" error="0.0000018" />
        <abundance value="0.48268" error="0.00321" />
      </isotope>
      <isotope mass-number="66">
        <mass value="65.9260364" error="0.0000017" />
        <abundance value="0.27975" error="0.00077" />
      </isotope>
      <isotope mass-number="67">
        <mass value="66.9271305" error="0.0000017" />
        <abundance value="0.04102" error="0.00021" />
      </isotope>
      <isotope mass-number="68">
        <mass value="67.9248473" error="0.0000017" />
        <abundance value="0.19024" error="0.00123" />
      </isotope>
      <isotope mass-number="70">
        <mass value="69.925325" error="0.000004" />
        <abundance value="0.00631" error="0.00009" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Ga" atomic-number="31">
    <natural-abundance>
      <mass value="69.723" error="0.001" />
      <isotope mass-number="69">
        <mass value="68.925581" error="0.000003" />
        <abundance value="0.60108" error="0.00009" />
      </isotope>
      <isotope mass-number="71">
        <mass value="70.9247073" error="0.0000020" />
        <abundance value="0.39892" error="0.00009" />
      </isotope>
    </natural-abundance>
  </entry>
   
  <entry symbol="Ge" atomic-number="32">
    <natural-abundance>
      <mass value="72.64" error="0.01" />
      <isotope mass-number="70">
        <mass value="69.9242500" error="0.0000019" />
        <abundance value="0.2038" error="0.0018" />
      </isotope>
      <isotope mass-number="72">
        <mass value="71.9220763" error="0.0000016" />
        <abundance value="0.2731" error="0.0026" />
      </isotope>
      <isotope mass-number="73">
        <mass value="72.9234595" error="0.0000016" />
        <abundance value="0.0776" error="0.0008" />
      </isotope>
      <isotope mass-number="74">
        <mass value="73.9211784" error="0.0000016" />
        <abundance value="0.3672" error="0.0015" />
      </isotope>
      <isotope mass-number="76">
        <mass value="75.9214029" error="0.0000016" />
        <abundance value="0.0783" error="0.0007" />
      </isotope>
    </natural-abundance>
  </entry>

  <entry symbol="As" atomic-number="33">
    <natural-abundance>
      <mass value="74.92160" error="0.00002" />
      <isotope mass-number="75">
        <mass value="74.9215966" error="0.0000018" />
        <abundance value="1" error="0" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Se" atomic-number="34">
    <natural-abundance>
      <mass value="78.96" error="0.03" />
      <isotope mass-number="74">
        <mass value="73.9224767" error="0.0000016" />
        <abundance value="0.0089" error="0.0004" />
      </isotope>
      <isotope mass-number="76">
        <mass value="75.9192143" error="0.0000016" />
        <abundance value="0.0937" error="0.0029" />
      </isotope>
      <isotope mass-number="77">
        <mass value="76.9199148" error="0.0000016" />
        <abundance value="0.0763" error="0.0016" />
      </isotope>
      <isotope mass-number="78">
        <mass value="77.9173097" error="0.0000016" />
        <abundance value="0.2377" error="0.0028" />
      </isotope>
      <isotope mass-number="80">
        <mass value="79.9165221" error="0.0000020" />
        <abundance value="0.4961" error="0.0041" />
      </isotope>
      <isotope mass-number="82">
        <mass value="81.9167003" error="0.0000022" />
        <abundance value="0.0873" error="0.0022" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Br" atomic-number="35">
    <natural-abundance>
      <mass value="79.904" error="0.001" />
      <isotope mass-number="79">
        <mass value="78.9183379" error="0.0000020" />
        <abundance value="0.5069" error="0.0007" />
      </isotope>
      <isotope mass-number="81">
        <mass value="80.916291" error="0.000003" />
        <abundance value="0.4931" error="0.0007" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Kr" atomic-number="36">
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        <mass value="77.920388" error="0.000007" />
        <abundance value="0.00355" error="0.00003" />
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      <isotope mass-number="80">
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      <isotope mass-number="82">
        <mass value="81.9134850" error="0.0000028" />
        <abundance value="0.11593" error="0.00031" />
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      <isotope mass-number="83">
        <mass value="82.914137" error="0.000004" />
        <abundance value="0.11500" error="0.00019" />
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      <isotope mass-number="84">
        <mass value="83.911508" error="0.000003" />
        <abundance value="0.56987" error="0.00015" />
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        <abundance value="0.17279" error="0.00041" />
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  <entry symbol="Rb" atomic-number="37">
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        <mass value="84.9117924" error="0.0000027" />
        <abundance value="0.7217" error="0.0002" />
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      <isotope mass-number="87">
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        <abundance value="0.2783" error="0.0002" />
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    </natural-abundance>
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  <entry symbol="Sr" atomic-number="38">
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      <isotope mass-number="84">
        <mass value="83.913426" error="0.000004" />
        <abundance value="0.0056" error="0.0001" />
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      <isotope mass-number="86">
        <mass value="85.9092647" error="0.0000025" />
        <abundance value="0.0986" error="0.0001" />
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      <isotope mass-number="87">
        <mass value="86.9088816" error="0.0000025" />
        <abundance value="0.0700" error="0.0001" />
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      <isotope mass-number="88">
        <mass value="87.9056167" error="0.0000025" />
        <abundance value="0.8258" error="0.0001" />
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    </natural-abundance>
  </entry>
  
  <entry symbol="Y" atomic-number="39">
    <natural-abundance>
      <mass value="88.90585" error="0.00002" />
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        <mass value="88.9058485" error="0.0000026" />
        <abundance value="1" error="0" />
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    </natural-abundance>
  </entry>
  
  <entry symbol="Zr" atomic-number="40">
    <natural-abundance>
      <mass value="91.224" error="0.002" />
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        <mass value="89.9047022" error="0.0000024" />
        <abundance value="0.5145" error="0.0040" />
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      <isotope mass-number="91">
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        <abundance value="0.1122" error="0.0005" />
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      <isotope mass-number="92">
        <mass value="91.9050386" error="0.0000023" />
        <abundance value="0.1715" error="0.0008" />
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      <isotope mass-number="94">
        <mass value="93.9063144" error="0.0000026" />
        <abundance value="0.1738" error="0.0028" />
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        <mass value="95.908275" error="0.000003" />
        <abundance value="0.0280" error="0.0009" />
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  <entry symbol="Nb" atomic-number="41">
    <natural-abundance>
      <mass value="92.90638" error="0.00002" />
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        <mass value="92.9063762" error="0.0000024" />
        <abundance value="1" error="0" />
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  </entry>
  
  <entry symbol="Mo" atomic-number="42">
    <natural-abundance>
      <mass value="95.94" error="0.02" />
      <isotope mass-number="92">
        <mass value="91.906810" error="0.000004" />
        <abundance value="0.1477" error="0.0031" />
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      <isotope mass-number="94">
        <mass value="93.9050867" error="0.0000020" />
        <abundance value="0.0923" error="0.0010" />
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      <isotope mass-number="95">
        <mass value="94.9058406" error="0.0000020" />
        <abundance value="0.1590" error="0.0009" />
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      <isotope mass-number="96">
        <mass value="95.9046780" error="0.0000020" />
        <abundance value="0.1668" error="0.0001" />
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      <isotope mass-number="97">
        <mass value="96.9030201" error="0.0000020" />
        <abundance value="0.0956" error="0.0005" />
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        <mass value="97.9054069" error="0.0000020" />
        <abundance value="0.2419" error="0.0026" />
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        <mass value="99.907476" error="0.000006" />
        <abundance value="0.0967" error="0.0020" />
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    </natural-abundance>
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  <entry symbol="Ru" atomic-number="44">
    <natural-abundance>
      <mass value="101.07" error="0.02" />
      <isotope mass-number="96">
        <mass value="95.907604" error="0.000009" />
        <abundance value="0.0554" error="0.0014" />
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      <isotope mass-number="98">
        <mass value="97.905287" error="0.000007" />
        <abundance value="0.0187" error="0.0003" />
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      <isotope mass-number="99">
        <mass value="98.9059385" error="0.0000022" />
        <abundance value=".01276" error="0.0014" />
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      <isotope mass-number="100">
        <mass value="99.9042189" error="0.0000022" />
        <abundance value="0.1260" error="0.0007" />
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      <isotope mass-number="101">
        <mass value="100.9055815" error="0.0000022" />
        <abundance value="0.1706" error="0.0002" />
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      <isotope mass-number="102">
        <mass value="101.9043488" error="0.0000022" />
        <abundance value="0.3155" error="0.0014" />
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      <isotope mass-number="104">
        <mass value="103.905430" error=".01862" />
        <abundance value="0.1862" error="0.0027" />
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  </entry>
  
  <entry symbol="Rh" atomic-number="45">
    <natural-abundance>
      <mass value="1025.90550" error="0.00002" />
      <isotope mass-number="103">
        <mass value="102.905504" error="0.000003" />
        <abundance value="1" error="0" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Pd" atomic-number="46">
    <natural-abundance>
      <mass value="106.42" error="0.01" />
      <isotope mass-number="102">
        <mass value="101.905607" error="0.000003" />
        <abundance value="0.0102" error="0.0001" />
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      <isotope mass-number="104">
        <mass value="103.904034" error="0.000005" />
        <abundance value="0.1114" error="0.0008" />
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      <isotope mass-number="105">
        <mass value="104.905083" error="0.000005" />
        <abundance value="0.2233" error="0.0008" />
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      <isotope mass-number="106">
        <mass value="105.903484" error="0.000005" />
        <abundance value="0.2733" error="0.0003" />
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      <isotope mass-number="108">
        <mass value="107.903895" error="0.000004" />
        <abundance value="0.2646" error="0.0009" />
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      <isotope mass-number="110">
        <mass value="109.905153" error="0.000012" />
        <abundance value="0.1172" error="0.0009" />
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    </natural-abundance>
  </entry>
  
  <entry symbol="Ag" atomic-number="47">
    <natural-abundance>
      <mass value="107.8682" error="0.0002" />
      <isotope mass-number="107">
        <mass value="106.905093" error="0.000006" />
        <abundance value="0.51839" error="0.00008" />
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      <isotope mass-number="109">
        <mass value="108.904756" error="0.000003" />
        <abundance value="0.48161" error="0.00008" />
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    </natural-abundance>
  </entry>
  
  <entry symbol="Cd" atomic-number="48">
    <natural-abundance>
      <mass value="112.411" error="0.008" />
      <isotope mass-number="106">
        <mass value="105.906458" error="0.000006" />
        <abundance value="0.0125" error="0.0006" />
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      <isotope mass-number="108">
        <mass value="107.904183" error="0.000006" />
        <abundance value="0.0089" error="0.0003" />
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      <isotope mass-number="110">
        <mass value="109.903006" error="0.000003" />
        <abundance value="0.1249" error="0.0018" />
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      <isotope mass-number="111">
        <mass value="110.904182" error="0.000003" />
        <abundance value="0.1280" error="0.0012" />
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      <isotope mass-number="112">
        <mass value="111.9027577" error="0.0000030" />
        <abundance value="0.2413" error="0.0021" />
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      <isotope mass-number="113">
        <mass value="112.9044014" error="0.0000030" />
        <abundance value="0.1222" error="0.0012" />
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        <mass value="113.9033586" error="0.0000030" />
        <abundance value="0.2873" error="0.0042" />
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      <isotope mass-number="116">
        <mass value="115.904756" error="0.000003" />
        <abundance value="0.0749" error="0.0018" />
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  </entry>
  
  <entry symbol="In" atomic-number="49">
    <natural-abundance>
      <mass value="114.818" error="0.003" />
      <isotope mass-number="113">
        <mass value="112.904062" error="0.000004" />
        <abundance value="0.0429" error="0.0005" />
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      <isotope mass-number="115">
        <mass value="114.903879" error="0.000040" />
        <abundance value="0.9571" error="0.0005" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Sn" atomic-number="50">
    <natural-abundance>
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      <isotope mass-number="112">
        <mass value="111.904822" error="0.000005" />
        <abundance value="0.0097" error="0.0001" />
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      <isotope mass-number="114">
        <mass value="113.902783" error="0.000003" />
        <abundance value="0.0066" error="0.0001" />
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      <isotope mass-number="115">
        <mass value="114.903347" error="0.000003" />
        <abundance value="0.0034" error="0.0001" />
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      <isotope mass-number="116">
        <mass value="115.901745" error="0.000003" />
        <abundance value="0.1454" error="0.0009" />
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      <isotope mass-number="117">
        <mass value="116.902955" error="0.000003" />
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      <isotope mass-number="118">
        <mass value="117.901608" error="0.000003" />
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      <isotope mass-number="119">
        <mass value="118.903311" error="0.000003" />
        <abundance value="0.0859" error="0.0004" />
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      <isotope mass-number="120">
        <mass value="119.9021985" error="0.0000027" />
        <abundance value="0.3258" error="0.0009" />
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      <isotope mass-number="122">
        <mass value="121.9034411" error="0.0000029" />
        <abundance value="0.0463" error="0.0003" />
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      <isotope mass-number="124">
        <mass value="123.9052745" error="0.0000015" />
        <abundance value="0.0579" error="0.0005" />
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    </natural-abundance>
  </entry>
  
  <entry symbol="Sb" atomic-number="51">
    <natural-abundance>
      <mass value="121.760" error="0.001" />
      <isotope mass-number="121">
        <mass value="120.9038222" error="0.0000026" />
        <abundance value="0.5721" error="0.0005" />
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      <isotope mass-number="123">
        <mass value="122.9042160" error="0.0000022" />
        <abundance value="0.4279" error="0.0005" />
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    </natural-abundance>
  </entry>

  <entry symbol="Te" atomic-number="52">
    <natural-abundance>
      <mass value="127.60" error="0.03" />
      <isotope mass-number="120">
        <mass value="119.904026" error="0.000011" />
        <abundance value="0.0009" error="0.0001" />
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      <isotope mass-number="122">
        <mass value="121.9030558" error="0.0000029" />
        <abundance value="0.0255" error="0.0012" />
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      <isotope mass-number="123">
        <mass value="122.9042711" error="0.0000020" />
        <abundance value="0.0089" error="0.0003" />
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      <isotope mass-number="124">
        <mass value="123.9028188" error="0.0000016" />
        <abundance value="0.0474" error="0.0014" />
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      <isotope mass-number="125">
        <mass value="124.9044241" error="0.0000020" />
        <abundance value="0.0707" error="0.0015" />
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      <isotope mass-number="126">
        <mass value="125.9033049" error="0.0000020" />
        <abundance value="0.1884" error="0.0025" />
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      <isotope mass-number="128">
        <mass value="127.9044615" error="0.0000019" />
        <abundance value="0.3174" error="0.0008" />
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      <isotope mass-number="130">
        <mass value="129.9062229" error="0.0000021" />
        <abundance value="0.3408" error="0.0062" />
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  </entry>
  
  <entry symbol="I" atomic-number="53">
    <natural-abundance>
      <mass value="126.90447" error="0.00003" />
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        <mass value="126.904468" error="0.000004" />
        <abundance value="1" error="0" />
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  <entry symbol="Xe" atomic-number="54">
    <natural-abundance>
      <mass value="131.293" error="0.006" />
      <isotope mass-number="124">
        <mass value="123.9058954" error="0.0000021" />
        <abundance value="0.000952" error="0.000003" />
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      <isotope mass-number="126">
        <mass value="125.904268" error="0.000007" />
        <abundance value="0.000890" error="0.000002" />
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      <isotope mass-number="128">
        <mass value="127.9035305" error="0.0000015" />
        <abundance value="0.019102" error="0.000008" />
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      <isotope mass-number="129">
        <mass value="128.9047799" error="0.0000009" />
        <abundance value="0.264006" error="0.000082" />
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      <isotope mass-number="130">
        <mass value="129.9035089" error="0.0000011" />
        <abundance value="0.040710" error="0.000013" />
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      <isotope mass-number="131">
        <mass value="130.9050828" error="0.0000018" />
        <abundance value="0.212324" error="0.000030" />
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      <isotope mass-number="132">
        <mass value="131.9041546" error="0.0000015" />
        <abundance value="0.269086" error="0.000033" />
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      <isotope mass-number="134">
        <mass value="133.9053945" error="0.0000009" />
        <abundance value="0.104357" error="0.000021" />
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      <isotope mass-number="136">
        <mass value="135.907220" error="0.000008" />
        <abundance value="0.088573" error="0.000044" />
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  </entry>
  
  <entry symbol="Cs" atomic-number="55">
    <natural-abundance>
      <mass value="132.90545" error="0.00002" />
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        <mass value="132.905447" error="0.000003" />
        <abundance value="1" error="0" />
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    </natural-abundance>
  </entry>
  
  <entry symbol="Ba" atomic-number="56">
    <natural-abundance>
      <mass value="137.327" error="0.007" />
      <isotope mass-number="130">
        <mass value="129.906311" error="0.000007" />
        <abundance value="0.00106" error="0.00001" />
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      <isotope mass-number="132">
        <mass value="131.905056" error="0.000003" />
        <abundance value="0.00101" error="0.00001" />
      </isotope>
      <isotope mass-number="134">
        <mass value="133.904504" error="0.000003" />
        <abundance value="0.02417" error="0.00018" />
      </isotope>
      <isotope mass-number="135">
        <mass value="134.905684" error="0.000003" />
        <abundance value="0.000003" error="0.00012" />
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      <isotope mass-number="136">
        <mass value="135.904571" error="0.000003" />
        <abundance value="0.07854" error="0.00024" />
      </isotope>
      <isotope mass-number="137">
        <mass value="136.905822" error="0.000003" />
        <abundance value="0.11232" error="0.00024" />
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      <isotope mass-number="138">
        <mass value="137.905242" error="0.000003" />
        <abundance value="0.71698" error="0.00042" />
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    </natural-abundance>
  </entry>
  
  <entry symbol="La" atomic-number="57">
    <natural-abundance>
      <mass value="138.9055" error="0.0002" />
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        <mass value="137.907108" error="0.000004" />
        <abundance value="0.00090" error="0.00001" />
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      <isotope mass-number="139">
        <mass value="138.906349" error="0.000004" />
        <abundance value="0.99910" error="0.00001" />
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    </natural-abundance>
  </entry>
  
  <entry symbol="Ce" atomic-number="58">
    <natural-abundance>
      <mass value="140.116" error="0.001" />
      <isotope mass-number="136">
        <mass value="135.907140" error="0.000050" />
        <abundance value="0.00185" error="0.00002" />
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      <isotope mass-number="138">
        <mass value="137.905986" error="0.000011" />
        <abundance value="0.00251" error="0.00002" />
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      <isotope mass-number="140">
        <mass value="139.905" error="0.000003" />
        <abundance value="0.88450" error="0.00051" />
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      <isotope mass-number="142">
        <mass value="141.909241" error="0.000004" />
        <abundance value="0.11114" error="0.00051" />
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  </entry>
  
  <entry symbol="Pr" atomic-number="59">
    <natural-abundance>
      <mass value="140.90765" error="0.00002" />
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        <mass value="140.907648" error="0.000003" />
        <abundance value="1" error="0" />
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  </entry>
  
  <entry symbol="Nd" atomic-number="60">
    <natural-abundance>
      <mass value="144.24" error="0.03" />
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        <mass value="141.907719" error="0.000003" />
        <abundance value="0.272" error="0.005" />
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      <isotope mass-number="143">
        <mass value="142.909810" error="0.000003" />
        <abundance value="0.122" error="0.002" />
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        <mass value="143.910083" error="0.000003" />
        <abundance value="0.238" error="0.003" />
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        <mass value="144.912569" error="0.000003" />
        <abundance value="0.083" error="0.001" />
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      <isotope mass-number="146">
        <mass value="145.913113" error="0.000003" />
        <abundance value="0.172" error="0.003" />
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        <mass value="147.916889" error="0.000004" />
        <abundance value="0.057" error="0.001" />
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        <mass value="149.920887" error="0.000004" />
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  </entry>
  
  <entry symbol="Sm" atomic-number="62">
    <natural-abundance>
      <mass value="150.36" error="0.03" />
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        <mass value="143.911996" error="0.000004" />
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      <isotope mass-number="147">
        <mass value="146.914894" error="0.000003" />
        <abundance value="0.1499" error="0.0018" />
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      <isotope mass-number="148">
        <mass value="147.914818" error="0.1124" />
        <abundance value="0.1124" error="0.0010" />
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      <isotope mass-number="149">
        <mass value="148.917180" error="0.000003" />
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        <mass value="149.917272" error="0.000003" />
        <abundance value="0.0738" error="0.0001" />
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      <isotope mass-number="152">
        <mass value="151.919729" error="0.000003" />
        <abundance value="0.2675" error="0.0016" />
      </isotope>
      <isotope mass-number="154">
        <mass value="153.922206" error="0.000003" />
        <abundance value="0.2275" error="0.0029" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Eu" atomic-number="63">
    <natural-abundance>
      <mass value="151.964" error="0.001" />
      <isotope mass-number="151">
        <mass value="150.919846" error="0.000003" />
        <abundance value="0.4781" error="0.0006" />
      </isotope>
      <isotope mass-number="153">
        <mass value="152.921227" error="0.000003" />
        <abundance value="0.5219" error="0.0006" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Gd" atomic-number="64">
    <natural-abundance>
      <mass value="157.25" error="0.03" />
      <isotope mass-number="152">
        <mass value="151.919789" error="0.000003" />
        <abundance value="0.0020" error="0.0001" />
      </isotope>
      <isotope mass-number="154">
        <mass value="153.920862" error="0.000003" />
        <abundance value="0.0218" error="0.0003" />
      </isotope>
      <isotope mass-number="155">
        <mass value="154.922619" error="0.000003" />
        <abundance value="0.1480" error="0.0012" />
      </isotope>
      <isotope mass-number="156">
        <mass value="155.922120" error="0.000003" />
        <abundance value="0.2047" error="0.0009" />
      </isotope>
      <isotope mass-number="157">
        <mass value="156.923957" error="0.000003" />
        <abundance value="0.1565" error="0.0002" />
      </isotope>
      <isotope mass-number="158">
        <mass value="157.924101" error="0.000003" />
        <abundance value="0.2484" error="0.0007" />
      </isotope>
      <isotope mass-number="160">
        <mass value="159.927051" error="0.000003" />
        <abundance value="0.2186" error="0.0019" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Tb" atomic-number="65">
    <natural-abundance>
      <mass value="158.92534" error="0.00002" />
      <isotope mass-number="159">
        <mass value="158.925343" error="0.000003" />
        <abundance value="1" error="0" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Dy" atomic-number="66">
    <natural-abundance>
      <mass value="162.500" error="0.001" />
      <isotope mass-number="156">
        <mass value="155.924278" error="0.000007" />
        <abundance value="0.00056" error="0.00003" />
      </isotope>
      <isotope mass-number="158">
        <mass value="157.924405" error="0.000004" />
        <abundance value="0.00095" error="0.00003" />
      </isotope>
      <isotope mass-number="160">
        <mass value="159.925194" error="0.000003" />
        <abundance value="0.02329" error="0.00018" />
      </isotope>
      <isotope mass-number="161">
        <mass value="160.926930" error="0.000003" />
        <abundance value="0.18889" error="0.00042" />
      </isotope>
      <isotope mass-number="162">
        <mass value="161.926795" error="0.000003" />
        <abundance value="0.25475" error="0.00036" />
      </isotope>
      <isotope mass-number="163">
        <mass value="162.928728" error="0.000003" />
        <abundance value="0.24896" error="0.00042" />
      </isotope>
      <isotope mass-number="164">
        <mass value="163.929171" error="0.000003" />
        <abundance value="0.28260" error="0.00054" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Ho" atomic-number="67">
    <natural-abundance>
      <mass value="164.93032" error="0.00002" />
      <isotope mass-number="165">
        <mass value="164.930319" error="0.000003" />
        <abundance value="1" error="0" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Er" atomic-number="68">
    <natural-abundance>
      <mass value="167.259" error="0.003" />
      <isotope mass-number="162">
        <mass value="161.928775" error="0.000004" />
        <abundance value="0.00139" error="0.00005" />
      </isotope>
      <isotope mass-number="164">
        <mass value="163.929197" error="0.000004" />
        <abundance value="0.01601" error="0.00003" />
      </isotope>
      <isotope mass-number="166">
        <mass value="165.930290" error="0.000003" />
        <abundance value="0.33503" error="0.00036" />
      </isotope>
      <isotope mass-number="167">
        <mass value="166.932046" error="0.000003" />
        <abundance value="0.22869" error="0.00009" />
      </isotope>
      <isotope mass-number="168">
        <mass value="167.932368" error="0.000003" />
        <abundance value="0.26978" error="0.00018" />
      </isotope>
      <isotope mass-number="170">
        <mass value="169.935461" error="0.000003" />
        <abundance value="0.14910" error="0.00036" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Tm" atomic-number="69">
    <natural-abundance>
      <mass value="168.93421" error="0.00002" />
      <isotope mass-number="169">
        <mass value="168.934211" error="0.000003" />
        <abundance value="1" error="0" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Yb" atomic-number="70">
    <natural-abundance>
      <mass value="173.04" error="0.03" />
      <isotope mass-number="168">
        <mass value="167.933895" error="0.000005" />
        <abundance value="0.0013" error="0.0001" />
      </isotope>
      <isotope mass-number="170">
        <mass value="169.934759" error="0.000003" />
        <abundance value="0.0304" error="0.0015" />
      </isotope>
      <isotope mass-number="171">
        <mass value="170.936323" error="0.000003" />
        <abundance value="0.1428" error="0.0057" />
      </isotope>
      <isotope mass-number="172">
        <mass value="171.936378" error="0.000003" />
        <abundance value="0.2183" error="0.0067" />
      </isotope>
      <isotope mass-number="173">
        <mass value="172.938207" error="0.000003" />
        <abundance value="0.1613" error="0.0027" />
      </isotope>
      <isotope mass-number="174">
        <mass value="173.938858" error="0.000003" />
        <abundance value="0.3183" error="0.0092" />
      </isotope>
      <isotope mass-number="176">
        <mass value="175.942569" error="0.000003" />
        <abundance value="0.1276" error="0.0041" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Lu" atomic-number="71">
    <natural-abundance>
      <mass value="174.967" error="0.001" />
      <isotope mass-number="175">
        <mass value="174.9407682" error="0.0000028" />
        <abundance value="0.9741" error="0.0002" />
      </isotope>
      <isotope mass-number="176">
        <mass value="175.9426827" error="0.0000028" />
        <abundance value="0.0259" error="0.0002" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Hf" atomic-number="72">
    <natural-abundance>
      <mass value="178.49" error="0.02" />
      <isotope mass-number="174">
        <mass value="173.940042" error="0.000004" />
        <abundance value="0.0016" error="0.0001" />
      </isotope>
      <isotope mass-number="176">
        <mass value="175.941403" error="0.000003" />
        <abundance value="0.0526" error="0.0007" />
      </isotope>
      <isotope mass-number="177">
        <mass value="176.9432204" error="0.0000027" />
        <abundance value="0.1860" error="0.0009" />
      </isotope>
      <isotope mass-number="178">
        <mass value="177.9436981" error="0.0000027" />
        <abundance value="0.2728" error="0.0007" />
      </isotope>
      <isotope mass-number="179">
        <mass value="178.9488154" error="0.0000027" />
        <abundance value="0.1362" error="0.0002" />
      </isotope>
      <isotope mass-number="180">
        <mass value="179.9465488" error="0.0000027" />
        <abundance value="0.3508" error="0.0016" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Ta" atomic-number="73">
    <natural-abundance>
      <mass value="180.9479" error="0.0001" />
      <isotope mass-number="180">
        <mass value="179.947466" error="0.000003" />
        <abundance value="0.00012" error="0.00002" />
      </isotope>
      <isotope mass-number="181">
        <mass value="180.947996" error="0.000003" />
        <abundance value="0.99988" error="0.00002" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="W" atomic-number="74">
    <natural-abundance>
      <mass value="183.84" error="0.01" />
      <isotope mass-number="180">
        <mass value="179.946706" error="0.000005" />
        <abundance value="0.0012" error="0.0001" />
      </isotope>
      <isotope mass-number="182">
        <mass value="181.948205" error="0.000003" />
        <abundance value="0.265" error="0.0016" />
      </isotope>
      <isotope mass-number="183">
        <mass value="182.9502242" error="0.0000030" />
        <abundance value="0.1431" error="0.0004" />
      </isotope>
      <isotope mass-number="184">
        <mass value="183.9509323" error="0.0000030" />
        <abundance value="0.3064" error="0.0002" />
      </isotope>
      <isotope mass-number="186">
        <mass value="185.954362" error="0.000003" />
        <abundance value="0.2843" error="0.0019" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Re" atomic-number="75">
    <natural-abundance>
      <mass value="186.207" error="0.001" />
      <isotope mass-number="185">
        <mass value="184.952955" error="0.000003" />
        <abundance value="0.3740" error="0.0002" />
      </isotope>
      <isotope mass-number="187">
        <mass value="186.9557505" error="0.0000030" />
        <abundance value="0.6260" error="0.0002" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Os" atomic-number="76">
    <natural-abundance>
      <mass value="190.23" error="0.03" />
      <isotope mass-number="184">
        <mass value="183.952491" error="0.000003" />
        <abundance value="0.0002" error="0.0001" />
      </isotope>
      <isotope mass-number="186">
        <mass value="185.953838" error="0.000003" />
        <abundance value="0.0159" error="0.0003" />
      </isotope>
      <isotope mass-number="187">
        <mass value="186.9557476" error="0.0000030" />
        <abundance value="0.0196" error="0.0002" />
      </isotope>
      <isotope mass-number="188">
        <mass value="187.9558357" error="0.0000030" />
        <abundance value="0.1324" error="0.0008" />
      </isotope>
      <isotope mass-number="189">
        <mass value="188.958145" error="0.000003" />
        <abundance value="0.1615" error="0.0005" />
      </isotope>
      <isotope mass-number="190">
        <mass value="189.958445" error="0.000003" />
        <abundance value="0.2626" error="0.0002" />
      </isotope>
      <isotope mass-number="192">
        <mass value="191.961479" error="0.000004" />
        <abundance value="0.4078" error="0.0019" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Ir" atomic-number="77">
    <natural-abundance>
      <mass value="192.217" error="0.003" />
      <isotope mass-number="191">
        <mass value="190.960591" error="0.000003" />
        <abundance value="0.373" error="0.002" />
      </isotope>
      <isotope mass-number="193">
        <mass value="192.962923" error="0.000003" />
        <abundance value="0.627" error="0.002" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Pt" atomic-number="78">
    <natural-abundance>
      <mass value="195.078" error="0.002" />
      <isotope mass-number="190">
        <mass value="189.959930" error="0.000007" />
        <abundance value="0.00014" error="0.00001" />
      </isotope>
      <isotope mass-number="192">
        <mass value="191.961035" error="0.000004" />
        <abundance value="0.00782" error="0.00007" />
      </isotope>
      <isotope mass-number="194">
        <mass value="193.962663" error="0.000003" />
        <abundance value="0.32967" error="0.00099" />
      </isotope>
      <isotope mass-number="195">
        <mass value="194.964774" error="0.000003" />
        <abundance value="0.33832" error="0.00010" />
      </isotope>
      <isotope mass-number="196">
        <mass value="195.964934" error="0.000003" />
        <abundance value="0.25242" error="0.00041" />
      </isotope>
      <isotope mass-number="198">
        <mass value="197.967875" error="0.000005" />
        <abundance value="0.07163" error="0.00055" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Au" atomic-number="79">
    <natural-abundance>
      <mass value="196.96655" error="0.00002" />
      <isotope mass-number="197">
        <mass value="196.966551" error="0.000003" />
        <abundance value="1" error="0" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Hg" atomic-number="80">
    <natural-abundance>
      <mass value="200.59" error="0.02" />
      <isotope mass-number="196">
        <mass value="195.965814" error="0.000004" />
        <abundance value="0.0015" error="0.0001" />
      </isotope>
      <isotope mass-number="198">
        <mass value="197.966752" error="0.000003" />
        <abundance value="0.0997" error="0.0020" />
      </isotope>
      <isotope mass-number="199">
        <mass value="198.968262" error="0.000003" />
        <abundance value="0.1687" error="0.0022" />
      </isotope>
      <isotope mass-number="200">
        <mass value="199.968309" error="0.000003" />
        <abundance value="0.2310" error="0.0019" />
      </isotope>
      <isotope mass-number="201">
        <mass value="200.970285" error="0.000003" />
        <abundance value="0.1318" error="0.0009" />
      </isotope>
      <isotope mass-number="202">
        <mass value="201.970625" error="0.000003" />
        <abundance value="0.2986" error="0.0026" />
      </isotope>
      <isotope mass-number="204">
        <mass value="203.973475" error="0.000003" />
        <abundance value="0.0687" error="0.0015" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Tl" atomic-number="81">
    <natural-abundance>
      <mass value="204.3833" error="0.0002" />
      <isotope mass-number="203">
        <mass value="202.972329" error="0.000003" />
        <abundance value="0.2952" error="0.0001" />
      </isotope>
      <isotope mass-number="205">
        <mass value="204.974412" error="0.000003" />
        <abundance value="0.7048" error="0.0001" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Pb" atomic-number="82">
    <natural-abundance>
      <mass value="207.2" error="0.1" />
      <isotope mass-number="204">
        <mass value="203.973028" error="0.000003" />
        <abundance value="0.014" error="0.001" />
      </isotope>
      <isotope mass-number="206">
        <mass value="205.974449" error="0.000003" />
        <abundance value="0.241" error="0.001" />
      </isotope>
      <isotope mass-number="207">
        <mass value="206.975880" error="0.000003" />
        <abundance value="0.221" error="0.001" />
      </isotope>
      <isotope mass-number="208">
        <mass value="207.976636" error="0.000003" />
        <abundance value="0.524" error="0.001" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Bi" atomic-number="83">
    <natural-abundance>
      <mass value="208.98038" error="0.00002" />
      <isotope mass-number="209">
        <mass value="208.980384" error="0.000003" />
        <abundance value="1" error="0" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Th" atomic-number="90">
    <natural-abundance>
      <mass value="232.0381" error="0.0001" />
      <isotope mass-number="232">
        <mass value="232.0380495" error="0.0000022" />
        <abundance value="1" error="0" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="Pa" atomic-number="91">
    <natural-abundance>
      <mass value="231.03588" error="0.00002" />
      <isotope mass-number="231">
        <mass value="231.03588" error="0.00002" />
        <abundance value="1" error="0" />
      </isotope>
    </natural-abundance>
  </entry>
  
  <entry symbol="U" atomic-number="92">
    <natural-abundance>
      <mass value="238.02891" error="0.00003" />
      <isotope mass-number="234">
        <mass value="234.0409447" error="0.0000022" />
        <abundance value="0.000054" error="0.000005" />
      </isotope>
      <isotope mass-number="235">
        <mass value="235.0439222" error="0.0000021" />
        <abundance value="0.007204" error="0.000006" />
      </isotope>
      <isotope mass-number="238">
        <mass value="238.0507835" error="0.0000022" />
        <abundance value="0.992742" error="0.000010" />
      </isotope>
    </natural-abundance>
  </entry>
  
</atomic-mass-table>