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Isotope
01
each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, leading to variation in atomic mass
Example
Carbon-12 and carbon-14 are isotopes of carbon, with the former having 6 neutrons and the latter having 8 neutrons.
Deuterium and tritium are isotopes of hydrogen, distinguished by their different numbers of neutrons.
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