Question

whay copper has 2 valency​

Answer 1

Answer:

Explanation:: According to Aufbau Principle, 4s orbital is filled before 3d orbital and hence, the... Copper is one of the transition elements and thus exhibits variable oxidation states. It has two valencies: +1 and +2 and the corresponding atoms are termed as Cuperous (+1 valency) and Cupric (+2 valency).