The valency of copper is variable, meaning it can have different valencies depending on the compound it is in. Copper can have a valency of 1 or 2. According to the valency chart provided by BYJUS, copper has a valency of 2 and 1. The valency of an element is a measure of its combining capacity and can be defined as the number of electrons that must be lost or gained by an atom to obtain a stable configuration.