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  4. Presence of three unpaired electrons in p-orbital of phosphorus can be explained by

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Q. Presence of three unpaired electrons in p-orbital of phosphorus can be explained by

Rajasthan PETRajasthan PET 2001

Solution:

According to Hund's rule, electron pairing will not take place in orbitals of same energy(same sub-shell) until each orbital is first singly filled with parallel spin.
$ P(15)=1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{3}} $

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