University of Maryland
Um: Quantum Mechanics of One and Two Electron Atoms
An explanation of Hund's rule and how to apply it to quantum mechanics. A mathematical-based explanation.
University of Colorado
University of Colorado: Physics 2000: The Pauli Exclusion Principle
This site from the University of Colorado at Boulder has great information on the Pauli Exclusion Principle. Pictures are provided along with links to additional information. The information provided is not in-depth and it is...
University of Colorado
University of Colorado: Physics 2000: Elements as Atoms: Spin
A basic explanation of spin and how it relates to electrons and quantum numbers.
Other
Chemtopics: Atomic Orbitals & Electron Configurations [Pdf]
Solutions to the Schrodinger wave equation give four types of atomic orbitals. Explanation of how quantum numbers specify these orbitals.
Other
Chemtopics: Understanding the Schrodinger Eqn.
The Schrodinger equation specifies atomic orbitals which are occupied by an electron. Quantum numbers can identify a unique energy level for each electron (set up in a PowerPoint presentation).