Nuclei of isotopes differ in

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(B) Isotopes are atoms of the same element that have the same atomic number $(Z)$ but different mass numbers $(A)$.Since the atomic number is defined

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The number of neutrons

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(B) Isotopes are atoms of the same element that have the same atomic number $(Z)$ but different mass numbers $(A)$.Since the atomic number is defined by the number of protons,isotopes have the same number of protons.However,because the mass number is the sum of protons and neutrons $(A = Z + N)$,a difference in mass number implies a difference in the number of neutrons $(N)$.Therefore,isotopes differ in the number of neutrons.

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