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Variable Valency Representing

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Question

Write the symbols of two metals that have variable valencies.

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Solution

Variable valency: Some elements exhibit more than one valency. They are said to have variable valency, e.g. iron, copper, tin, lead.
Iron (Fe): ${Fe}^{2 +} or {Fe}^{3 +}$
Copper (Cu): ${Cu}^{+} or {Cu}^{2 +}$

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