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same element, different weight class — atoms that share a name but argue about heft

twin protonsSame proton count, different neutron count
radioactive clocksCarbon-14 dates bones up to 50,000 years
medical spiesRadioactive tracers light up tumors from inside
hydrogen trioComes as protium, deuterium, and tritium
unstable kinSome isotopes decay in fractions of a second
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