Atomic mass or weight is the average mass of the protons, neutrons, and electrons in an element's atoms.
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Atomic Mass or Weight Definition:
Atomic mass or atomic weight is the average mass
of an element
, calculated using the relative abundance of isotopes
in a naturally-occurring element.
Also Known As: Atomic Weight
Examples: The atomic mass of carbon is 12.011; the atomic mass of hydrogen is 1.0079
How To Calculate Atomic Mass