Define variable valency.Give examples to state the name of your examples according to 1 old naming system 2 iupac system of naming
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Certain elements have more than one valency. 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).
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Valency of an element can be both positive and negative. ... This property of having different capacity to combine with different elements is called variable valency. For example in ferrous oxide valency of iron is +2, whereas in ferric oxide valency of iron is +3.
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