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What is Variable Valency? Name Two Elements Having Variable Valency and State Their Valencies. - Chemistry

What is variable valency? Name two elements having variable valency and state their 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       Fe2+ or Fe3+
Copper   cu        cu+ or cu2+

Concept: Atomic Number (Z)
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Selina Concise Chemistry Class 8 ICSE
Chapter 4 Atomic Structure
Exercise | Q 11 | Page 52
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