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

💡 Solution & Explanation

Bohr's second postulate states that angular momentum of a revolving electron is quantized: L = n * h / (2*π) = 0.5 * n * h/π, where n must be an integer (1, 2, 3, ...). Comparing the options: (a) 1.5 * h/π corresponds to n = 3, (b) 0.5 * h/π corresponds to n = 1, (c) 1.25 * h/π corresponds to n = 2.5 (which is non-integral and thus forbidden).