Which of the following statements correctly defines a pair of isotopes?

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A Atoms with the same mass number but different atomic numbers.
B Atoms with the same atomic number but different mass numbers.
C Atoms with the same number of neutrons but different protons.
D Atoms with identical physical properties but different chemical reactions.

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Answer: B. Atoms with the same atomic number but different mass numbers.

Isotopes are atoms of the same element with the same number of protons (same atomic number) but a different number of neutrons (different mass numbers), such as carbon-12 and carbon-14.

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Which of the following statements correctly defines a pair of isotopes?

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