At the heart of the Sun, 400 trillion trillion trillion hydrogen nuclei fuse into helium every second, releasing more energy than humans have used since the beginning of civilization.
Princeton Plasma Physics Laboratory: This site features eight ways to learn about fusion energy.
Great Atomics Fusion Group: You will find a fusion slide show and teacher resources on the electromagnetic spectrum.
Chemical Elements: Good site for middle school students for information on the Periodic Table of Elements.
Chem4kids: A great site for students to learn about the periodic table, atoms, and chemical reactions.