Correct set of four quantum numbers for the valence electron of rubidium (Z = 37) is — Atomic Structure Chemistry Question

💡 Solution & Explanation

The alkali metal rubidium (Rb, Z = 37) lies in Group 1, Period 5. Its ground-state electronic configuration is [Kr] 5s^1. The single valence electron resides in the 5s orbital. For a 5s orbital, the quantum numbers are: n = 5, l = 0, m = 0, and the spin s is +1/2 (or -1/2). This corresponds to option (a).