Question

why do elements shows variable valency?​

Answer 1

Answer:

The electrons which are present in an atom's outermost shell are called valence electrons. Such elements therefore indicate two or more different valencies i.e. they have variable valentia.

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Answer 2

Answer:

Normally, the metals donate electrons from their valence shell, so as to form positively charged ions. However, some metals lose electrons from the shell next to the valence shell. In such a situation the element exhibits more than one electropositive valency. Such elements are said to have variable valency.

Explanation:

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