Isotopes of an element are atoms that share the same?

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1. Isotopes of an element are atoms that share the same?

Number of protons, but differ in their number of neutrons

Number of neutrons, but differ in their number of protons

Number of both protons and neutrons

None of the above

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Isotopes are variants of the same element, sharing an identical proton count but differing in how many neutrons their nuclei contain.