Crescent Public Schools
The Internet Science Room: The Periodic Table and Atomic Theory of Matter
A chemistry tutorial highlighting historical development of the atomic theory of matter and the periodic table of elements.
CK-12 Foundation
Ck 12: Flex Book Textbooks: Chemistry Second Edition
[Free Registration/Login may be required to access all resource tools.] A complete, web-based, multi-media textbook covering a wide variety of Chemistry concepts.