Proton number and nucleon number

Proton number (also called atomic number)

The proton number is equal to the number of protons in the nucleus of an atom.

The proton number is also equal to the number of electrons in orbit around a neutral atom.

Nucleon number (also called mass number)

The nucleon number is equal to the total number of nucleons (protons and neutrons) in the nucleus of an atom.

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