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  4. In the ground state of phosphorus total number of unpaired electrons are:

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Q. In the ground state of phosphorus total number of unpaired electrons are:

Haryana PMTHaryana PMT 2002

Solution:

Phosphorus (at. no. $=15$ ) Electronic configuration $=1 s^{2} 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{3}$ Number of unpaired electrons $=3$