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Question

What do you understand by the term variable valency?


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Solution

Variable Valency: In the case of the atoms of transition elements, ions formed after the loss of valency electrons do not possess a stable core as the configuration of the outermost shell is not ns2np6 but(ns2np6nd1-10). This shell generally loses one or more electrons giving rise to metal ions of higher valencies.

The transition elements show variable valency involving valence electrons and d-electrons of the penultimate energy shell. The common valence of transition metals is either 2 or 3.


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