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Isotopes are atoms that have the same number atomic number, but different mass numbers due to a change in the number of neutrons. tafsir mimpi pocong The three isotopes of carbon can be referred to as carbon-12 ( 126 C 6 12 C ), carbon-13 ( 136 C 6 13 C ), and carbon-14 ( 146 C 6 14 C ) refers to the nucleus of a given isotope of an element