The state is — Atomic Structure Chemistry Question

💡 Solution & Explanation

State $S_1$ is spherically symmetric, meaning $l=0$ (s-orbital). It has one radial node, meaning $n - l - 1 = 1 \implies n - 0 - 1 = 1 \implies n = 2$. Thus, $S_1$ is the 2s orbital. Therefore, correct answer is B.