why does variable valency exist in non metals
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variable valency means a single element in different valencies combine with other elements to form the compund.
It is not necessary that the element is non metal which will show variable valency all those which has vacant orbitals will show variable valency
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the number of the atom which which one atom of an element can combine is called its valency variable valency exists on some metal can loss different number of electrons to form ions with different charges that's why they exist variable valency .
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