Q. Which of the following is not a permissible arrangement of electrons in an atom?
A) n = 5, l = 3, m = 0, s = +1/2
B) n = 3, l = 2, m = −3, s = −1/2
C) n = 3, l = 2, m = −2, s = −1/2
D) n = 4, l = 0, m = 0, s = −1/2
Explanation
[Solution from source] For l = 2 the magnetic quantum number can only take values from −2 to +2, so m = −3 is not allowed. The other sets obey all the rules (l < n, |m| ≤ l, s = ±1/2). Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.