Link 1: Periodic Table - Periodic Table of Elements

Includes Chemistry Hangman toward the bottom of the page and some interesting links like:

Link 2: The Chemistry of Teeth Whitening - ElementsDatabase.com

Link 3: The Chemistry of Paper Money - ElementsDatabase.com

Link 4: The Chemistry of Polymer Banknotes - ElementsDatabase.com

Toward the top of the page there is also a link to a Periodic Table Quiz. There are also other resources not listed here. Well worth a look.