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The latest release of the Periodic Table (dated 4 May 2022) includes the most recent abridged standard atomic weight values released by the IUPAC Commission on Isotopic Abundances and Atomic Weights (CIAAW), compiled as part of the 2021 Table of Standard Atomic Weights 2021.
For elements that lack isotopes with a characteristic isotopic abundance in natural terrestrial samples, the mass number of the nuclide with the longest confirmed half-life is listed between square brackets. See PAC (AOP 4 May 2022; https://doi.org/10.1515/pac-2019-0603) for full details or visit Commission II.1 @ciaaw.org
Download the PDF version (letter size or A4) or A3 (PDF) or see earlier versions
Check out SPECIAL Chem Int Jan 2019 — International Year of the Periodic Table (IYPT) — with contributions by Jan Reedijk, Natalia Tarasova, G.J.
Leigh, Sigurd Hofmann, Eric Scerri, Juris Meija, Norman E. Holden, Tyler B. Coplen, Peter Mahaffy, Ian Mills, Roberto Marquardt, and more.
IUPAC