In presence of external magnetic field, p-orbital is — Atomic Structure Chemistry Question

💡 Solution & Explanation

In the absence of a magnetic field, the three p-orbitals are degenerate. When an external magnetic field is applied, the Zeeman effect causes them to split into three separate energy levels based on their distinct $m$ quantum numbers (-1, 0, +1), rendering them non-degenerate. Therefore, correct answer is D.