The
atomic mass (
ma) is the
mass of an atomic particle, sub-atomic particle, or molecule. It is commonly expressed in
unified atomic mass units (u) where by international agreement, 1 unified atomic mass unit is defined as 1/12 of the mass of a single carbon-12 atom (at rest). For atoms, the protons and neutrons of the nucleus account for almost all of the mass, and the atomic mass measured in u has nearly the same value as the
mass number.