Atomic Mass (noun) Definition, Meaning & Examples

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noun Chemistry.
  1. the mass of an isotope of an element measured in units formerly based on the mass of one hydrogen atom taken as a unit or on 1/16 (0.0625) the mass of one oxygen atom, but after 1961 based on 1/12 (0.0833) the mass of the carbon-12 atom.
noun chem
  1. the mass of an isotope of an element in atomic mass units
  2. short for relative atomic mass See atomic weight
    Atomic Mass (noun) Definition, Meaning & Examples

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