Question

The element which shows variable valency is_____

Answer 1

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given below is one of the answers to your question

The valency of an element is always a whole number. Some elements exhibit more than one valency, i.e., they have variable valency. In Iron [II] sulfate or ferrous sulfate, i.e., FeSO4, the valency of iron is two. In Iron [III] sulfate or ferric sulfate, i.e., Fe2(SO4)3, the valency of iron is three.