Asked by keyboard | 24th Jul, 2008, 12:49: PM

Expert Answer:

Phosphorus has electronic configuration =2,8,5

so because of 5 electrons in outer most shell it has valency=5

and in the exited state it loses 2 electrons and then its valency become 3.

Answered by  | 24th Jul, 2008, 03:10: PM

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