question_answer

The correct set of quantum numbers for the unpaired electron of a chlorine atom is

A)  2, 0, 0, + 1/2    

B)  2, 1, -1, +1/2

C)  3, 1, -1, \[\pm \] 1/2   

D)  3, 0, 0, \[\pm \] ½

Correct Answer: C

Solution :

\[_{17}Cl=1{{s}^{2}},2{{s}^{2}},2{{p}^{6}},3{{s}^{2}},3{{p}^{5}}\] Hence, 15th electron in chlorine atom is unpaired. From the above, it is clear that for this electron, \[n=3\] \[l=1\] \[m=-1\] \[s=\pm \frac{1}{2}\]