why phosphorus velency is 5
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Phosphorus valency is -3 and also 5 as it has 5 electrons in its valence shell and -3 if it gains 3 electrons to attain stability
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Phosphorus(Atomic no. 15) has its electrons arranged in a configuration of 2,8,5. ... So one can either add 3 electrons to the outer orbit or take away 5 electrons with equal ease. So Phosphorus has a valency of 3 or 5
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