Chem4kids
Chem4 Kids: Argon (Ar)
Chem4Kids looks at the 18th element in the periodic table, argon. Content focuses on argon's electrons, where you can find argon in nature and in the home, and how argon combines with other elements.
Web Elements
Web Elements Periodic Table: Argon
Webelements offers a nicely designed page with a great deal of relevant information on argon. Very helpful.