PBS
Pbs Learning Media: Diamonds: The Science Behind the Sparkle
This illustrated essay from the NOVA Web site explains why the atomic structure of a diamond slows down light and produces a sparkle more brilliant than from any other colorless substance.
Open Curriculum
Open Curriculum: The Atom
Learn about atoms and their properties of motion with this illustrated article.
Khan Academy
Khan Academy: Discovery of the Electron and Nucleus
Learn about Thomson's cathode ray experiment and the plum pudding model and Rutherford's gold foil experiment.
Khan Academy
Khan Academy: Polyatomic Ions
How to name ionic compounds containing common polyatomic ions.
Khan Academy
Khan Academy: Naming Monatomic Ions and Ionic Compounds
Learn how to name monatomic ions and ionic compounds containing monatomic ions, predict charges for monatomic ions, and understand formulas.