International Union of Pure and Applied Chemistry (original) (raw)

Pure Appl. Chem. 75(8), 1107-1122, 2003

Pure and Applied Chemistry

Vol. 75, Issue 8

INORGANIC CHEMISTRY DIVISION
COMMISSION ON ATOMIC WEIGHTS AND ISOTOPIC ABUNDANCES

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:

| | From | To | | | ---------- | ------------- | --------------- | | Zinc | 65.39 ± 0.02 | 65.409 ± 0.004 | | Krypton | 83.80 ± 0.01 | 83.798 ± 0.002 | | Molybdenum | 95.94 ± 0.01 | 95.94 ± 0.02 | | Dysprosium | 162.50 ± 0.03 | 162.500 ± 0.001 |

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.

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