Question

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

Answer 1

Chlorine, [Ne]3s23p5 , n=3 straightaway because that is the highest energy level here, and since the outermost electron is in the p orbital, this is the same as l=1 . ml can be −1,0,+1 , but since there are 5 electrons, you count five, so −1,0,+1,−1,0 , which means the last electron has ml=0 .