Question

which elements does not exhibit variable valency​

Answer 1

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The s-block elements do not show variable valency. However, p-block elements with higher atomic number transition and inner transition elements show variable valency. Inert pair effect in p-block elements.

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Answer 2

The s-block elements do not show variable valency. However, p-block elements with higher atomic number transition and inner transition elements show variable valency. Inert pair effect in p-block elements.