Topic: Quantum Numbers

This episode explains that quantum numbers are a set of four values that serve as a unique address for every electron. The Pauli exclusion principle states that no two electrons can have the same four quantum numbers. The four numbers are: n (principal, for energy level), l (angular momentum, for orbital shape), ml​ (magnetic, for orbital orientation), and ms​ (spin, for electron direction). These numbers relate directly to electron configuration and change when an atom forms an ion.