Which statement correctly describes the valency exhibited by phosphorus?
Phosphorus can exhibit valency of three or five
Phosphorus (atomic number 15) has five electrons in its outermost shell (2, 8, 5).
It can use three of them in bonding, as in PCl3, or all five, as in PCl5.
So phosphorus shows variable valency, three or five.
Hence, the answer is that phosphorus can exhibit valency of three or five.
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