Atomic Weights of the Elements 1999

Coplen, T. B.

doi:doi:10.1063/1.1395055

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Journal of Physical and Chemical Reference Data / Volume 30 / Issue 3

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J. Phys. Chem. Ref. Data 30, 701 (2001); http://dx.doi.org/10.1063/1.1395055 (12 pages)

Atomic Weights of the Elements 1999

T. B. Coplen

U.S. Geological Survey, 431 National Center, Reston, Virginia 20192

(Received June 6 2001)

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The biennial review of atomic-weight, A_r(E), determinations and other cognate data have resulted in changes for the standard atomic weights of the following elements: fromtonitrogen math

sulfur32.066±0.00632.065±0.005chlorine35.4527±0.000935.453±0.002germanium72.61±0.0272.64±0.01xenon131.29±0.02131.293±0.006erbium167.26±0.03167.259±0.003uranium238.0289±0.0001238.028 91±0.000 03Presented 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 atomic mass values and half-lives of selected radioisotopes. Changes in the evaluated isotopic abundance values from those published in 1997 are so minor that an updated list will not be published for the year 1999. Many elements have a different isotopic composition in some nonterrestrial materials. Some recent data on parent nuclides that might affect isotopic abundances or atomic-weight values are included in this report for the information of the interested scientific community.© 2001 American Institute of Physics.