Title: Atomic Weights of the Elements 2007 (IUPAC Technical Report)
Citation: PURE AND APPLIED CHEMISTRY vol. 81 no. 11 p. 2131-2156
Publication Year: 2009
JRC N°: JRC45848
ISSN: 0033-4545
URI: http://www.iupac.org/publications/pac/81/11/2131/
DOI: 10.1351/PAC-REP-09-08-03
Type: Articles in periodicals and books
Abstract: The latest evaluation of atomic weight determinations and other cognate data has warranted five changes for the standard atomic weights of the elements, Ar(E), from those published previously in the Table of Atomic Weights 2005. The revised standard atomic weight of nickel, Ar(Ni), is 58.6934(4); zinc, Ar(Zn), is 65.38(2); molybdenum, Ar(Mo), is 95.96(2); ytterbium, Ar(Yb), is 173.054(5); and lutetium, Ar(Lu), is 174.9668(1). Standard atomic weight tables abridged to four and five significant figures were also evaluated. The Commission-recommended value for the isotope-amount ratio of n(40Ar)/n(36Ar), which is of importance in geochronology and geochemistry, has been changed to 298.56(31) from 296.03(53) based on new measurements. Atmospheric O2 is recognized as an international measurement standard, along with Vienna Standard Mean Ocean Water (VSMOW) and Vienna Pee Dee Belemnite (VPDB) carbonate for measurement and reporting of differences in relative oxygen isotope-amount ratios delta(17O) and delta(18O).
JRC Directorate:Health, Consumers and Reference Materials

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