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The Language of Chemistry — CHEMISTRY STD 9 — Question

ICSE BoardEnglish MediumSTD 9CHEMISTRYThe Language of Chemistry2 Marks
Question
Explain the terms 'valency' and 'variable valency'.
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Answer

Valency : The number of electrons that an atom can lose, gain or share during a chemical reaction is called its valency.
Variable valency : Certain elements exhibit more than one valency, i.e. they show variable valency.

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