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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Isomer Definition
Chemistry Glossary Definition of Isomer
By Anne Marie Helmenstine, Ph.D., About.com Guide
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