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QuarkyFermion
the atomic mass is the number of neutron and proton an atom have. Atomic number/proton number is the number of proton or electron on atome have.

Hope this helps! xD
would not mind if you put it as the brainliest answer
Atomic mass is the average mass of atoms of an element, calculated using the relative abundance of isotopes in a naturally-occurring element. ....And number of protons in an atom is Atomic number