http://www.nasa.gov/audience/forstudents/9-12/features/index.html
(Sample link) National Geographic http://www.nationalgeographic.com
Periodic Table http://periodic.lanl.gov/default.htm
Expanded octets http://www.wwnorton.com/college/chemistry/gilbert/tutorials/ch7.htm
VSEPR HTTP://WWW.CHEM.PURDUE.EDU/GCHELP/VSEPR/STRUCTUR2.HTML