What is the formula for a mass number of an atom?

What is the formula for a mass number of an atom?

Q. What is the formula for a mass number of an atom?

A.            Number of protons + number of electrons.

B.            Number of neutrons + number of electrons.

C.            Number of protons + number of neutrons.

D.            None of these.

Answer: Number of protons + number of neutrons.

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