Why Phosphorus has two valency-3,5?
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It contains empty 3d orbitals so phosphorus can expand its octet by exciting on electron from 3s to 3d . Hence phosphorus can show valency 3 and 5 both. As it is a non metal , it tequire more 3 electrons to attain stable or noble configuration by forming ionic bound.
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2atomic no:15
therefore,electronic conf:2,8,5
to attain octet state it can lose 5 electron or gain 3 electron
therefore,electronic conf:2,8,5
to attain octet state it can lose 5 electron or gain 3 electron
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