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Question
Q139) The number of electron having m=-1 in phosphorus atom is



SOLUTION

P , Z=15
E.C. 1s2 2s2 2p6 3s2 3p3
For l=-1 is for 2p which is full thus 2 electron
and 3p is half filled thus 1 electron
total electrons=2+1=3
Answer:(a)