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Pure Appl. Chem., 2013, Vol. 85, No. 5, pp. 1047-1078

Published online 2013-04-29


Atomic weights of the elements 2011 (IUPAC Technical Report)

Michael E. Wieser1*, Norman Holden2, Tyler B. Coplen3, John K. Böhlke3, Michael Berglund4, Willi A. Brand5, Paul De Bièvre6, Manfred Gröning7, Robert D. Loss8, Juris Meija9, Takafumi Hirata10, Thomas Prohaska11, Ronny Schoenberg12, Glenda O’Connor13, Thomas Walczyk14, Shige Yoneda15 and Xiang‑Kun Zhu16

1 Department of Physics and Astronomy, University of Calgary, Calgary, Canada
2 Brookhaven National Laboratory, Upton, NY, USA
3 U.S. Geological Survey, Reston, VA, USA
4 Institute for Reference Materials and Measurements, Geel, Belgium
5 Max Planck Institute for Biogeochemistry, Jena, Germany
6 Independent Consultant on MiC, Belgium
7 International Atomic Energy Agency, Seibersdorf, Austria
8 Department of Applied Physics, Curtin University of Technology, Perth, Australia
9 National Research Council of Canada, Ottawa, Canada
10 Kyoto University, Kyoto, Japan
11 Department of Chemistry, University of Natural Resources and Applied Life Sciences, Vienna, Austria
12 Institute for Geosciences, University of Tübingen, Tübingen, Germany
13 New Brunswick Laboratory, Argonne, IL, USA
14 Department of Chemistry (Science) and Department of Biochemistry (Medicine), National University of Singapore (NUS), Singapore
15 National Museum of Nature and Science, Tokyo, Japan
16 Chinese Academy of Geological Sciences, Beijing, China

Abstract: The biennial review of atomic-weight determinations and other cognate data has resulted in changes for the standard atomic weights of five elements. The atomic weight of bromine has changed from 79.904(1) to the interval [79.901, 79.907], germanium from 72.63(1) to 72.630(8), indium from 114.818(3) to 114.818(1), magnesium from 24.3050(6) to the interval [24.304, 24.307], and mercury from 200.59(2) to 200.592(3). For bromine and magnesium, assignment of intervals for the new standard atomic weights reflects the common occurrence of variations in the atomic weights of those elements in normal terrestrial materials.