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

💡 Solution & Explanation

Rubidium (Rb) is in Group 1, period 5. Its outer electronic configuration is $5s^1$. For the 5s electron, $n=5, l=0, m=0, s=+1/2$ (or -1/2). Therefore, correct answer is A.