![]() ![]() 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. ![]() The latest release of the Periodic Table (dated ) 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. ![]()
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