Question

Find out some more elements which have variable valency?
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Answer 1

Elements having Variable valency.

Copper, Tin, Iron and Mercury exhibit variable valency.

What is Variable Valency?

Sometimes, because of different conditions under which a chemical reaction takes place, the valency of the same element changes. Thus metals like lead, tin, copper, mercury, iron etc exhibit variable valency.

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.