why valency of phosphorus is 3 and 5
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the atomic number of p is 15
1s 2 2s 2 2p 6 3s 2 3p 3
in this state valency is 3
in the exited state
1s 2 2s 2 2p 6 3s 1 3p 3 3d 1
in this state the valency is 5
1s 2 2s 2 2p 6 3s 2 3p 3
in this state valency is 3
in the exited state
1s 2 2s 2 2p 6 3s 1 3p 3 3d 1
in this state the valency is 5
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