Which of the following is not a permissible value of angular momentum of electron in H-atom? — Atomic Structure Chemistry Question

💡 Solution & Explanation

Angular momentum $L = n\frac{h}{2\pi}$. For $n=1, 2, 3$, $L = 0.5 \frac{h}{\pi}, \frac{h}{\pi}, 1.5 \frac{h}{\pi}$. The value $1.25 \frac{h}{\pi}$ would correspond to $n=2.5$, which is not an integer. Therefore, correct answer is C.