Atomic mass

Atomic mass, literally the mass of an atom, is the approximately equivalent to the number of protons and neutrons in an atom. In case of isotopes, the atomic mass is equivalent to the average of abundances of protons and neutrons in different isotopes. It is expressed in atomic mass unit, 'amu' in short.

Nearby pages
Atomic mass unit, Atomic number, Atomic physics, Atomic pile, Atomic power