Which quantum number describes the spatial orientation of an atomic orbital with respect to an external magnetic field?

💡 Solution & Explanation

The magnetic quantum number determines the spatial orientation of an atomic orbital when subjected to an external magnetic field, defining the number of degenerate orbitals in a subshell. The principal quantum number governs overall energy level and size, while the azimuthal number dictates orbital shape. Quantum numbers are fundamental concepts tested in physical chemistry entrance questions.