Atomic weights of the elements 2007 (IUPAC Technical Report)

Michael E. Wieser 1  and Michael Berglund 2
  • 1 Department of Physics and Astronomy, University of Calgary, Canada
  • 2 European Commission, Joint Research Centre, Institute for Reference Materials and Measurements (IRMM), Belgium

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 δ(17O) and δ(18O).

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