International Union of Pure and Applied Chemistry

<HTML> <HEAD> <META NAME="GENERATOR" CONTENT="Adobe PageMill 2.0 Mac"> <TITLE>International Union of Pure and Applied Chemistry</TITLE> </HEAD> <BODY bgcolor="#FFFFFF" background="../../../../images/back_image.gif" LINK="cc0033" vlink="4040ff"> <TABLE BORDER="0" CELLSPACING="0" CELLPADDING="0" WIDTH="600"> <TR CELLSPACING="0" CELLPADDING="0"> <TD VALIGN="TOP" align="left"> <img Hspace= "0" Vspace="0" src="../../../../images/iupactop2.gif"> </td> <TD ALIGN="center" bgcolor="cc0033" width = 100%>I  U  P  A  C </TD> </tr> </table> <TABLE BORDER="0" CELLSPACING="0" CELLPADDING="0" WIDTH="600"> <td VALIGN="top" WIDTH="118">       <A HREF="../../../../news/index.html">News & Notices </A> <A HREF="../../../../organ/index.html"> Organizations & People</A> <A HREF="../../../../standing/index.html">Standing Committees </A> <A HREF="../../../../divisions/index.html">Divisions </A> <a href="../../../../projects/index.html">Projects</a> <A HREF="../../../../reports/index.html">Reports</A> <A HREF="../../../index.html">Publications </A><a href="../../../ci/index.html">. . CI</a> <a href="../../index.html">. . PAC</a> <a href="../../../macro/index.html">. . Macro. Symp. </a> <a href="../../../books/index.html">. . Books</a> <a href="../../../sds/index.html">. . Solubility Data</a> <A HREF="../../../../symposia/index.html">Symposia</A> <A HREF="../../../../affiliates/index.html">AMP</A> <A HREF="../../../../links/index.html">Links of Interest</a> <A HREF="../../../../general/index.html">Search the Site</a> <a href="../../../../index.html">Home Page</a> </td> <TD WIDTH="4"> </TD> <TD WIDTH="478" align="left" valign="top"> Pure Appl. Chem. 75(8), 1107-1122, 2003 <center> Pure and Applied Chemistry Vol. 75, Issue 8 <a href="../../../../divisions/II/index.html">INORGANIC CHEMISTRY DIVISION</a> COMMISSION ON ATOMIC WEIGHTS AND ISOTOPIC ABUNDANCES </center> <blockquote> Atomic weights of the elements 2001 (IUPAC Technical Report) R. D. Loss Department of Applied Physics, Curtin University of Technology, Perth, Western Australia Abstract: The biennial review of atomic-weight, Ar(E), determinations and other cognate data have resulted in changes for the standard atomic weights of the following elements: <table width="81%" border="0" cellspacing="5" cellpadding="0"> <tr> <td> </td> <td>From</td> <td>To</td> </tr> <tr> <td>Zinc</td> <td>65.39 ± 0.02</td> <td>65.409 ± 0.004</td> </tr> <tr> <td>Krypton</td> <td>83.80 ± 0.01</td> <td>83.798 ± 0.002</td> </tr> <tr> <td>Molybdenum</td> <td>95.94 ± 0.01 </td> <td>95.94 ± 0.02</td> </tr> <tr> <td>Dysprosium</td> <td>162.50 ± 0.03</td> <td>162.500 ± 0.001</td> </tr> </table> Presented are updated tables of the standard atomic weights and their uncertainties estimated by combining experimental uncertainties and terrestrial variabilities. In addition, this report again contains an updated table of relative atomicmass values and half-lives of selected radioisotopes. Changes in the evaluated isotope abundance values from those published in 1997 are relatively minor and will be published in a major review of each element in 2003. Many elements have a different isotopic composition in some nonterrestrial materials. Some recent data on parent nuclides that might affect isotope abundances or atomic-weight values are included in this report for the information of the interested scientific community. <div align="right"> [<a href="index.html">Back to Contents</a>] > Download full text of the report [<a href="../pdf/7508x1107.pdf">pdf file - 208KB</a>] > <a href="../../../../projects/1981/210_2_81.html">View corresponding project</a> </div> </blockquote> <center> </center> <center> <hr width="50%"> </center> <div align="left"> Page last modified 31 August 2003. Copyright © 2003 International Union of Pure and Applied Chemistry. Questions or comments about IUPAC, please contact, the <A HREF="../../../../news/contact.html">Secretariat</A>. 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