Which quantum number describes the intrinsic angular momentum or spin of an electron around its own axis within an atomic orbital?

💡 Solution & Explanation

The spin quantum number designates the direction of the intrinsic angular momentum of an electron, taking values of plus one-half or minus one-half. The principal quantum number determines shell size and energy, the azimuthal number determines subshell shape, and the magnetic number specifies spatial orientation. Pauli exclusion principle dictates that no two electrons in an atom can share identical sets of all four quantum numbers.