JEE Main 1989 Chemistry question on Atomic Structure
The correct set of quantum numbers for the unpaired electron of chlorine atom is
A.
n=2,l=1,m=0
B.
n=2,l=1,m=1
C.
n=3,l=1,m=1
D.
n=3,l=0,m=0
Show answer and solution
Correct option: C
Solution
Chlorine (Z=17) has configuration 1s² 2s² 2p⁶ 3s² 3p⁵. The unpaired electron is in the 3p subshell, so n=3 and l=1. By convention, filling the three p orbitals (m = -1, 0, +1) with 5 electrons pairs up m=-1 and m=0, leaving m=+1 with the unpaired electron. Thus n=3, l=1, m=1 is correct.
[1989]
Practise Atomic Structure the way it is asked
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