question_answer

The number of unpaired electrons in \[1{{s}^{2}},2{{s}^{2}}2{{p}^{3}}\]is:

A)  1    

B)  2    

C)  3    

D)  5

Correct Answer: C

Solution :

 \[1{{s}^{2}},2{{s}^{2}}2{{p}^{3}}\]can be shown as Therefore, the number of unpaired electron is three.