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Standard atomic weights of the elements 2021 (IUPAC Technical Report)

Journal Article · · Pure and Applied Chemistry
 [1];  [2];  [3];  [3];  [4];  [3];  [5];  [6];  [7];  [8];  [9];  [10];  [11];  [12];  [13];  [14];  [15];  [16];  [17];  [18] more »;  [19] « less
  1. Montanuniversität Leoben, Leoben (Austria)
  2. Montanuniversität Leoben, Leoben (Austria); Univ. of Natural Resources and Life Sciences, Vienna (Austria); Helmholtz Centre Geesthacht (Germany); Univ. of Calgary, AB (Canada)
  3. US Geological Survey, Reston, VA (United States)
  4. Hickam Air Force Base. Defense POW/MIA Accounting Agency (DPAA) Laboratory, Pearl Harbor, HI (United States)
  5. Chinese Academy of Geological Sciences, Beijing (China)
  6. LGC Ltd, Teddington (United Kingdom). National Measurement Laboratory
  7. International Atomic Energy Agency (IAEA), Vienna (Austria). Terrestrial Environmental Radiochemistry Laboratory
  8. Brookhaven National Lab. (BNL), Upton, NY (United States)
  9. Univ. of Groningen (Netherlands). Centre for Isotope Research (CIO)
  10. Max Planck Institute for Biogeochemistry, Jena (Germany)
  11. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  12. Univ. of Tokyo (Japan)
  13. Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin (Germany)
  14. National Univ. of Singapore (Singapore)
  15. National Institute of Metrology, Beijing (China)
  16. Univ. of Calgary, AB (Canada)
  17. National Museum of Nature and Science, Tokyo (Japan)
  18. Chinese Academy of Sciences (CAS), Beijing (China)
  19. National Research Council of Canada, Ottawa, ON (Canada)
+ Show Author Affiliations
Following the reviews of atomic-weight determinations and other cognate data in 2015, 2017, 2019 and 2021, the IUPAC (International Union of Pure and Applied Chemistry) Commission on Isotopic Abundances and Atomic Weights (CIAAW) reports changes of standard atomic weights. The symbol A r°(E) was selected for standard atomic weight of an element to distinguish it from the atomic weight of an element E in a specific substance P, designated A r(E, P). The CIAAW has changed the values of the standard atomic weights of five elements based on recent determinations of terrestrial isotopic abundances. The standard atomic weight of argon and lead have changed to an interval to reflect that the natural variation in isotopic composition exceeds the measurement uncertainty of A r(Ar) and A r(Pb) in a specific substance. The standard atomic weights and/or the uncertainties of fourteen elements have been changed based on the Atomic Mass Evaluations 2016 and 2020 accomplished under the auspices of the International Union of Pure and Applied Physics (IUPAP). A r° of Ho, Tb, Tm and Y were changed in 2017 and again updated in 2021.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
SC0012704
OSTI ID:
1798495
Report Number(s):
BNL-221671-2021-JAAM
Journal Information:
Pure and Applied Chemistry, Journal Name: Pure and Applied Chemistry Journal Issue: 0 Vol. 0; ISSN 0033-4545
Publisher:
IUPACCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Argon
LSVEC
ciaaw.org
hafnium
iridium
lead
ytterbium