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Atoms with the same number of protons, but different numbers of neutrons in the nucleus of an atom
isotope
The total number of protons and neutrons in the nucleus of an atom
mass number
The number of protons in the nucleus of an atom
atomic number
The weighted average of the masses of the isotopes of an element
atomic mass
On twelfth the mass of a carbon atom having six protons and six neutrons
atomic mass unit