what is the valency
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the valency of an element is the number of electrons an atom of the element uses to combine with atoms of other elements...
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Valency is the combining power of an element. Elements in the same group of the periodic table have the same valency. The valency of an element is related to how many electrons are in the outer shell. The noble gases have the valency 0 as they do not usually combine with other elements.
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