question_answer

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

A)  3                                            

B)  5

C)  8                                            

D)  9

Correct Answer: A

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