Question

The correct set of quantum numbers for the unpaired electron of chlorine atom is :
> n l m
(a) 2 1 0
(b) 2 1 1
(c) 3 1 1
(d) 3 0 0

Answer 1

As the electronic configuration of chlorine is 1s2 , 2s2 2p6 , 3s2 3p5 . Thus the fifth electron in the 3p subshell has quantum numbers 3,1,1, ±1/2.