Issue Date: December 20, 2010
New Format For Atomic Weights
Breaking with a century-old tradition, the International Union of Pure & Applied Chemistry (IUPAC) is publishing a new table of standard atomic weights in which the values for 10 elements (H, Li, B, C, N, O, Si, S, Cl, Tl) will be given as mass ranges rather than single values. This historic change in format is being instituted to address the natural variation in a material’s isotope abundances, which depend on the sample’s . . .
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