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Isomer Definition

Chemistry Glossary Definition of Isomer

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These are the chemical structures of the isomers of dioxin.

These are the chemical structures of the isomers of dioxin.

Todd Helmenstine
Isomer Definition: An isomer is a chemical species with the same number and types of atoms as another chemical species, but possessing different properties. There are structural isomers, geometric isomers, optical isomers, and stereoisomers.

Examples: Pentane, 2-methylbutane, and 2,2-dimethylpropane are structural isomers of each other.

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