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It is the total number of protons and neutrons in an atom.​

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Answer:

mass number

Explanation:

The mass number is defined as the total number of protons and neutrons in an atom. The number of neutrons = mass number − atomic number.

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*Mass number

The mass number is defined as the total number of protons and neutrons in an atom. The number of neutrons = mass number − atomic number.

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