The difference between the mass number and the atomic number gives the _______.

number of neutrons

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number of electrons

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charge of an element

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number of protons

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Solution

The correct option is A number of neutrons
The mass number (A), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. The atomic number (Z) which denotes the number of protons in a nucleus. Hence, the difference between the mass number and the atomic number gives the number of neutrons (N) in a given nucleus $N = A - Z$ .

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