Question

Define valency and variable valency​

Answer 1

Valency is the combining capacity of an element. You can say that for a metal, it's valency is the number of valence electrons it has and for a non metal, it's 8 minus the number of valence electrons. ... The changed valency or valencies are called the variable valency....

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Answer 2

here is yøur answer

⭐In chemistry, the valence or valency of an element is a measure of its combining capacity with other atoms when it forms chemical compounds or molecules.

⭐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