These are molecules with the same structural formula but their atoms have different positions in space.

e.g. the CH3 groups in CH3CH=CHCH3 can be placed on the same side of the double bond in one stereoisomer and on opposite sides in another.

See also: Diastereomers, Enantiomers, Isometry, Optical Isomers, Racemic Mixture, Stereochemistry, Structural Isomerism.

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Subjects: Chemistry