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isotope

noun
/ˈaɪsətəʊp/
/ˈaɪsətəʊp/
(physics物理, chemistry化学)
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  1. one of two or more forms of a chemical element that have the same number of protons but a different number of neutrons in their atoms. They have different physical properties (= characteristics) but the same chemical ones.同位素
    • radioactive isotopes放射性同位素
    • the many isotopes of carbon碳的诸多同位素
    Topics Physics and chemistryc2
    Oxford Collocations DictionaryIsotope is used after these nouns:
    • carbon
    See full entry
    Word Origin1913: coined by F. Soddy, from iso- ‘equal’ + Greek topos ‘place’ (because the isotopes occupy the same place in the periodic table of elements).

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