Question

give reason why the valency of phrosparus is -3​

Answer 1

the valency of phosphorus is -3 because it has 5 electrons in its outermost shell.

Answer 2

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# WITH QUALITY

Phosphorus atoms, which have five valence electrons, are used for doping n-type silicon (phosphorous provides its fifth, free, electron). ... But the fifth valence electron remains free, without bonding responsibilities.