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No values are listed for elements which lack isotopes with a characteristic isotopic abundance in natural terrestrial samples.. See PAC for more details or visit Commission II 1 @ciaaw org. For users needing an atomic-weight value for an unspecified sample with disregard to the uncertainty, the conventional values are provided.
The latest release of the Periodic Table (dated 1 Dec 2018) includes the most recent updates released in June 2018 by the IUPAC Commission on Isotopic Abundances and Atomic Weights (CIAAW) (see related News,released 5 June 2018), and specifically for argon, the assignment of an interval for the new standard atomic weight which reflects the common occurrence of variations in the atomic weights of the element in normal terrestrial materials.. An interval in square brackets provides the lower and upper bounds of the standard atomic weight for that element.
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