What Does Atomic Mass Mean?


The atomic mass is the total mass of an atom as defined by the sum of all its subatomic particles. These particles are protons, neutrons, and electrons.
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atomic mass
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. Abbreviation: at. m.
Source: Dictionary.com
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