Standard Atomic Weights of the Elements 2021

Thomas Prohaska,Johanna Irrgeher,Jacqueline Benefield, John K. Böhlke,Lesley A. Chesson,Tyler B. Coplen,Tiping Ding, Philip J. H. Dunn,Manfred Gröning,N.E. Holden,Harro A. J. Meijer, Heiko Moossen,Antonio Possolo,Yoshio Takahashi,Jochen Vogl,Thomas Walczyk,Jun Wang,Michael E. Wieser,Shigekazu Yoneda,Xiangkun Zhu,Juris Meija

IUPAC Standards Online（2023）

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摘要

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 Ar°(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 Ar(E, P). The CIAAW has changed the values of the standard atomic weights of five elements based on recent determinations of terrestrial isotopic abundances:

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elements,standard

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