Question

List the elements of the periodic table that show variable valency.

Answer 1

Answer:

They exhibit variable valency. For example, copper, tin, iron and mercury exhibit variable valency. Copper combines with oxygen to form cuprous oxide (Cu2O) and cupric oxide (CuO). Valency of oxygen being two, combining capacity of copper in the first case is one and that in the second case is two.

Explanation:

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