What is variable valency?

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asked Apr 23 in Class VIII Science by muskan15 (-2,329 points)

What is variable valency? Name two elements having variable valency and state their valencies.

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answered Apr 23 by navnit40 (-2,750 points)

Variable valency: Some elements exhibit more than one valency. They are said to have variable valency, e.g. Iron, copper, tin, lead.
Iron         Fe       Fe2+ or Fe3+
Copper   cu        cu+ or cu2+

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