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#standard_atomic_weight

Standard atomic weight

Relative atomic mass as defined by IUPAC (CIAAW)

The standard atomic weight of a chemical element (symbol Ar°(E) for element "E") is the weighted arithmetic mean of the relative isotopic masses of all isotopes of that element weighted by each isotope's abundance on Earth. For example, isotope 63Cu (Ar = 62.929) constitutes 69% of the copper on Earth, the rest being 65Cu (Ar = 64.927), so

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Standard atomic weight Relative atomic mass Atomic mass Molar mass Commission on Isotopic Abundances and Atomic Weights Atomic number List of chemical elements Molecular mass Dalton (unit) Mass number
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