Which of the following set of quantum numbers is permissible? — Atomic Structure Chemistry Question

💡 Solution & Explanation

Set (a) is invalid because $m > l$. Set (c) is invalid because spin $s$ must be $\pm 1/2$. Set (d) is invalid because $l$ must be $< n$. Set (b) is valid because $n=4, l=2 (<n), m=-1 (\text{between } -l \text{ and } +l)$, and $s=+1/2$. Therefore, correct answer is B.