isomer
noun/ˈaɪsəmə(r)/
/ˈaɪsəmər/
- (chemistry) one of two or more compounds that have the same atoms, but in different arrangements
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- (physics) one of two or more nuclei that have the same atomic number, but different energy states
Word Originmid 19th cent.: from Greek isomerēs ‘sharing equally’, from isos ‘equal’ + meros ‘a share’.
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isomer