Isotopes of an element have

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(D) Isotopes are defined as atoms of the same element that have the same atomic number but different mass numbers. Since the atomic number is the same

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different number of neutrons

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(D) Isotopes are defined as atoms of the same element that have the same atomic number but different mass numbers. Since the atomic number is the same (number of protons),the number of protons is identical. However,because the mass number is the sum of protons and neutrons,a difference in mass number implies a different number of neutrons in the nucleus. Therefore,isotopes of an element have a different number of neutrons.

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