What is variable valency? Name two elements having variable valency and state their valences. please help me out
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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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(1) Certain elements have more than one valency , they exhibit variable valency.
(2) Two elements having variable valency are Copper , Tin
(3) Copper have +1+2 and Tin have +2+4
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