Number of protons plus the number of neutrons (electrons don't matter as they have such a small mass).
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The atomic mass of Mg is 24.3 amu.
It is 20.18
The atomic mass is the mass of a molecule, atomic particle or sub-atomic particle.
== The equation of atomic mass is protons+nuetrons== atomic mass. ===
Cobalt is an atomic mass of 58.93 atomic mass units