Essential Chemistry for IGCSE - Atoms, Elements And Compounds (Section 2 - No. 5)

Which of the following best describes the relationship between an atom and its isotopes?
Isotopes are atoms of different elements.
Isotopes have the same number of protons but different numbers of neutrons.
Isotopes have the same number of neutrons but different numbers of protons.
Isotopes have the same mass number.

Explanation

Isotopes are atoms of the same element with the same number of protons, but different numbers of neutrons, leading to different mass numbers.

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