The mass number of a nucleus is

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(D) The mass number $(A)$ is the sum of the number of protons $(Z)$ and neutrons $(N)$ in a nucleus,so $A = Z + N$.For the hydrogen nucleus $(_{1}^{1}

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Sometimes more than and sometimes equal to its atomic number

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(D) The mass number $(A)$ is the sum of the number of protons $(Z)$ and neutrons $(N)$ in a nucleus,so $A = Z + N$.For the hydrogen nucleus $(_{1}^{1}H)$,the number of protons is $1$ and the number of neutrons is $0$,so the mass number is $1$,which is equal to the atomic number $(A = Z)$.For all other nuclei,the number of neutrons is at least $1$ or more,making the mass number greater than the atomic number $(A > Z)$.Therefore,the mass number is sometimes equal to and sometimes greater than the atomic number.

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