Variable valency is characteristic of:

halogen

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transition elements

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alkali metals

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noble gas

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Solution

The correct option is D transition elements
In transition metals, $(n - 1)$ d and ns electrons have nearly same energy level. Hence, most of these electrons take part in chemical bonding. Hence, transition metals show variable valency.

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Similar questions

(a) Explain the terms 'valency' and 'variable valency'.

(b) How are the elements with variable valency named ? Explain with an example.

What is variable valency ? Give two examples of elements showing variable valency.

Variable valency of transition elements is on account of :

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