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English definition of “isotope”

isotope

noun [C] uk   /ˈaɪ.sə.təʊp/ us    /-toʊp/ specialized
a form of an atom that has a different atomic weight from other forms of the same atom but the same chemical structure: a radioactive isotope of hydrogenAtoms, molecules and sub-atomic particles
(Definition of isotope from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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