Question

what is variable valency​

Answer 1

Answer:

Certain elements combine with other atoms, donating, accepting or sharing electrons in different proportions depending on the nature of the reaction. For example, iron combines with oxygen to form ferrous oxide as well as ferric oxide. This is termed variable valency.

Answer 2

Sometimes, same element may exhibit one valency in one compound and another valency in other compound. This property is called as variable valency.

Example,Element,Symbol, Valencies exhibited (variable valencies)

Copper Cu 1, 2 Cu+1, Cu+2

Silver Ag 1, 2