Question

Why do some elements have variable valency ?​

Answer 1

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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Answer 2

Answer:

Some elements show variable valencybecause of the different electronic configurations. An atom of an element can sometimes lose more electrons than are present in its valence shell i.e. loss from the penultimate shell and hence exhibitmore than 1 or variable valency.