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Which of the following defines the Mass number of an atom?

Which of the following defines the Mass number of an atom?

Q. Which of the following defines the 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.            number of electrons

Answer: number of protons + number of neutrons

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