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Chapter 4: Atomic Structure
The Discovery of the Electron This site describes the history of the electron and its discoverer, J.J. Thomson. Visit this site and hear Thomson describe how he discovered these subatomic particles.
The Virtual Geiger
Counter[Updated link coming soon.]
Geiger counters measure amounts of radiation. Visit this site and test different radioactive materials to hear how they sound through a Geiger counter.
This site describes how electrons move from orbital to orbital as they absorb and release energy. Visit this site to discover how this produces an atomic spectrum.
The Quantum and
the Cosmos I
This virtual scrapbook described the historical development of quantum theory. Visit this site and explain how quantum theory revolutionized science.
The Photoelectric Effect
This Java Applet allows you to manipulate the energies needed to run a current through the wire. Visit this site and discover the photoelectric threshold of certain materials.