Atomic Weight of Indium | Commission on Isotopic Abundances and Atomic Weights

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"><head> <title>Atomic Weight of Indium | Commission on Isotopic Abundances and Atomic Weights</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <link rel="stylesheet" type="text/css" media="all" href="stylesheet.css"><link rel="shortcut icon" href="favicon.ico" /> <link href="css/theme.blue.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="js/jquery-1.11.1.min.js"></script> <script type="text/javascript" src="js/jquery.tablesorter.js"></script> <script type="text/javascript" src="js/jquery.tablesorter.min.js"></script> <script type="text/javascript" src="js/jquery.tablesorter.widgets.js"></script> <script language="JavaScript" type="text/javascript"> $(function() { $("#mytable").tablesorter({theme:'blue',headers:{3:{sorter:'brace'},4:{sorter:false}},widgets:['zebra'],widthFixed:true}); }); </script> <script type="text/javascript"> var _gaq = _gaq || []; _gaq.push(['_setAccount', 'UA-37565923-4']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); </script> </head> <body> <div id="pagewidth"> <div id="header-top" class="clearfix">  <div id="support-navigation"> <ul></ul> </div>   <div id="logo-top"> <a href="http://www.ciaaw.org"><img src="images/ciaaw.png" alt="Logo of the Atomic Weights Commission"></a> <a href="http://www.iupac.org" target="_blank"><img src="images/iupac.png" class="xx" alt="Logo of the International Union of Pure and Applied Chemistry"></a> </div>   <div id="main-navigation"> <ul> <li><a href="index.htm">Home</a></li> <li><a href="atomic-weights.htm">Atomic Weights</a></li> <li><a href="isotopic-abundances.htm">Isotopic Abundances</a></li> <li><a href="reference-materials.htm">Reference Materials</a></li> <li><a href="commission.htm">The Commission</a></li> <li><a href="info.htm">FAQ's</a></li> </ul> </div>  </div id="header-top">  <div id="breadcrumb"> <ul> <li><a href="index.htm">Other elements</a></li> </ul></div> <div id="content"> <div id="main-content"> <h1>Indium</h1><p><table id="mytable" class="tablesorter"><thead><tr><th>Isotope</th><th>Atomic mass (Da)</th><th>Isotopic abundance (amount fraction)</th></tr></thead> <tbody> <tr><td><sup>113</sup>In </td><td>112.904 060(2)</td><td>0.042 81(52)</td></tr> <tr><td><sup>115</sup>In </td><td>114.903 878 77(8)</td><td>0.957 19(52)</td></tr> </tbody></table><br> <p> In 1991, the Commission changed the recommended value for the atomic weight of indium to <i>A</i><sub>r</sub>(In) = 114.818(3) based on high precision measurements of the metal and its compounds. The new measurement represents a significant improvement in the precision of the atomic weight and is in agreement with the previous values. The Commission revised the standard atomic weight of indium in 2011 in light of new mass-spectrometric measurements. </p><p> <sup>115</sup>In is β– active with a half-life so long, 441(25)×10<sup>15</sup> a, that it neither affects <i>A</i><sub>r</sub>(In) nor has it given rise to recognized abnormal occurrences of tin. </p> <h9><font color=red>SOURCE</font>  <a href="publications.htm#P3">Atomic weights of the elements: Review 2000</a> by John R de Laeter et al. <i>Pure Appl. Chem.</i> 2003 (75) 683-800<br>© IUPAC 2003</h9> </div>  <div id="support-content"> <img src="images/p-table/In.png"><p class="credit">CIAAW</p> <p class="caption"><strong>Indium</strong><br> <i>A</i><sub>r</sub>(In) = 114.818(1) since 2011<br><br> The name derives from the term "indigo" for the indigo-blue line in the element's spark spectrum. It was discovered in 1863 by the German physicist Ferdinand Reich and the German metallurgist Hieronymus Theodor Richter, while examining zinc blende. They isolated indium in 1867. </p> </div id="support-content">  </div id="content">  <div id="push"></div></div id="pagewidth">  <div id="footer"> <img src="images/logo.png"><br><br> <a href="privacy.htm">Privacy policy</a>  |  <a href="impressum.htm">Impressum</a>  |  <a href="members.htm">Contact</a>  |  © CIAAW, 2007-2015 <br> </div>  </body></html>

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Atomic Weight of Indium | Commission on Isotopic Abundances and Atomic Weights