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isotope

All the isotopes of an element have the same number of protons in the nucleus BUT they have different numbers of neutrons in the nucleus. For example;

carbon-12 has 6 protons and 6 neutrons in the nucleus of the atom

carbon-13 has 6 protons and 7 neutrons in the nucleus of the atom

carbon-14 has 6 protons and 8 neutrons in the nucleus of the atom

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