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What is variable valency ? Give two examples of elements showing variable valency.

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Certain elements exhibit more than one valency, that means they show variable valency.
Ferrous is written as Iron (II) and Ferric is written as Iron (III).

MetalRadicalsValency
IronFerrous [Iron (II)]
Ferric [Iron (III)]
2
3
CopperCuprous [Copper (I)]
Cupric [Copper (II)]
1
2

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