Illustrated Glossary of Organic Chemistry

Configuration: The three-dimensional arrangement of atoms or groups in a molecule, usually in reference to stereoisomers.

Priorities: HO > CH3CH2 > CH3 > H. This molecule is (R)-2-butanol. R/S is an example of absolute configuration.

Priorities: I > CH3 and CH3CH2 > H. This molecule is (Z)-2-iodo-2-pentene. E/Z is an example of relative configuration.