Question

Question:
Define Atomic mass.​

Answer 1

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• Atomic mass in an atom or group of an atom is the sum of the masses of protons, neutrons and electrons.

Answer 2

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• The total mass of the protons, neutrons, and electrons in a single atom when it is at rest.Although the SI unit of mass is the kilogram, atomic mass is often expressed in the non-SI unit atomic mass unit or unified mass or dalton, where 1 amu or 1 u or 1 Da is defined as 1⁄12 of the mass of a single carbon-12 atom, at rest.