www.edu4kids.com

http://www.chemsoc.org/viselements/pages/pertable_j.htm

http://education.jlab.org/beamsactivity/online/index.html  - Games to reinforce the elements:

                                                                                                 concentration game

                                                                                                 flash card game

                                                                                                 hangman game

http://www.chemicalelements.com/

http://pearl1.lanl.gov/periodic/default.htm

http://www.webelements.com/