Structural-isomerism



noun, Chemistry.
1.
See under isomerism (def 1).
noun
1.
Chemistry. the relation of two or more compounds, radicals, or ions that are composed of the same kinds and numbers of atoms but differ from each other in structural arrangement (structural isomerism) as CH 3 OCH 3 and CH 3 CH 2 OH, or in the arrangement of their atoms in space and therefore in one or more properties.
Compare optical isomerism, stereoisomerism.
2.
Also called nuclear isomerism. Physics. the relation of two or more nuclides that have the same atomic number and mass number but different energy levels and half-lives.
3.
Chemistry, Physics. the phenomenon characterized by such a relation.
4.
the state or condition of being isomerous.
noun
1.
the existence of two or more compounds having the same molecular formula but a different arrangement of atoms within the molecule See also stereoisomerism, optical isomerism
2.
the existence of two or more nuclides having the same atomic numbers and mass numbers but different energy states

isomerism i·som·er·ism (ī-sŏm’ə-rĭz’əm)
n.

The phenomenon of the existence of isomers.

The complex of chemical and physical phenomena characteristic of or attributable to isomers.

The state or condition of being an isomer.

structural isomerism n.
Isomerism involving the same atoms in different arrangements.

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