University of Colorado
University of Colorado: Physics 2000: Spectral Lines
Several pages from an excellent site which describe the science of spectroscopy. The unique atomic emission (and absorption) line spectrum of elements are illustrated and explained. Includes a Java applet depicting the quantum energy...
University of Colorado
University of Colorado: Physics 2000: Elements as Atoms: Quantum Numbers
Each electron has a set of quantum numbers that specify it's location, orbital, and energy in a unique manner.