Isotopes of an element contain

the same number of protons but different number of neutrons
the same number of neutrons but different number of protons
equal number of protons and electrons
equal number of nucleons
the same number of protons but different number of neutrons  Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.

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