what is the variable valency
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Some elements join with other atoms to give, accept or exchange electrons in different amounts depending on the essence of the reaction. For starters, iron combines with oxygen to form both ferrous oxide and ferric oxide. It is called valence element.
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Some elements vary in their ability to interact with other elements, depending on the nature of the reaction; variable valence is called this property. Iron (Fe), for example, may have a valence of both 2 and 3.
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