Read the Assertion and Reason below and choose the correct option. — Atomic Structure Chemistry Question

💡 Solution & Explanation

Statement II is correct; in a single-electron system like $He^+$, the energy of an electron depends exclusively on the principal quantum number ($n$). Because of this, the 3s, 3p, and 3d orbitals are degenerate (have the same energy). Statement I is incorrect because the energy in the 3p-orbital is equal to, not greater than, the energy in the 3s-orbital. Therefore, correct answer is D.