Isotopes are atoms of the same element with the same atomic number but different mass numbers. For example, carbon has isotopes with mass numbers 12 and 14.
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Isotopes are variants of an element with the same number of protons but differing numbers of neutrons in their nuclei. For example, carbon-12 and carbon-14 are isotopes of carbon, with 6 protons but 6 and 8 neutrons, respectively.