question_answer

The atom of the element having atomic number 14 should have                                               [AMU 1984]

A)                 One unpaired electron 

B)                 Two unpaired electrons

C)                 Three unpaired electrons            

D)                 Four unpaired electrons

Correct Answer: B

Solution :

           Atomic number 14 leaving 2 unpaired electron            \[_{14}Si=1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{2}}\]