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Iun: Modern Atomic Theory
This is an excellent site with information on the discovery of the atom and the different models. Includes a sample question and answer using Planck's constant.
Upper Canada District School Board
Tom Stretton's Chemistry Pages: Atomic Theory Modern Ideas
This online slide show helps students understand modern scientific thinking which has shaped modern atomic theory.
Upper Canada District School Board
Tom Stretton's Chemistry Pages: Atomic Theory Early Ideas
This online slide show helps students understand the early historical thinking that contributed to modern atomic theory.
![Chemtopics: Development of Modern Atomic Theory [Pdf] Handout](https://d15y2dacu3jp90.cloudfront.net/images/attachment_defaults/resource/large/FPO-knovation.png "Chemtopics: Development of Modern Atomic Theory [Pdf] Handout")
Other
Chemtopics: Development of Modern Atomic Theory [Pdf]
A summary of the achievements of J. J. Thomson, Ernest Rutherford, Niels Bohr, and Erwin Schrodinger.
Physics4kids
Physics4 Kids: Modern Physics: Looking Into Atoms
Get an inside look the subatomic particles of atoms.
Other
Indiana University Northwest: The Aufbau Principle
The Aufbau Principle defined. Site contains charts, graphs, and examples to help in your learning of the Principle and its many purposes.