E-Z Notation

**Semantic type:** Classification

**Definition:** A system for naming the stereoisomers of a molecule. The configuration at each double bond is determined by the priority of the side groups and whether the highest priority groups are on the same or opposite side. A Z indicates that the highest-priority side groups are on the same side and an E indicates that the highest-priority side groups are on opposite sides. Priority is given to the bonded atom with the higher atomic number.

**Synonyms:** - E/Z Isomer Conformation