Essential Chemistry for IGCSE - Atoms, Elements And Compounds (Section 1 - No. 34)
What are isotopes?
Atoms with the same number of protons and neutrons.
Atoms with different numbers of protons.
Atoms with the same number of protons but different numbers of neutrons.
Atoms with the same mass number.
Explanation
Isotopes are atoms of the same element (same number of protons) that have different numbers of neutrons, resulting in different mass numbers.
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