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Dictionary search results  Showing 1-3 of 3 results  atomic mass
US English  the mass of an atom of a chemical element expressed
in atomic mass units. It is approximately equivalent to the
number of protons and neutrons in the atom (the mass number) or
to the average number allowing for the relative abundances of
different isotopes  atomic mass unit (abbreviation: amu) US
English   relative atomic mass US English  Another term for
atomic mass.