The Dynamic Periodic Table bills itself as “The most interactive Web 2.0 periodic table available. Dynamic layouts showing names, electrons, oxidation states, trend visualization, orbitals, isotopes, and instant search. Full descriptions in 30 languages from Wikipedia.” and it’s hard to argue with that description.

It’s a useful resource and any science teacher should have it bookmarked: http://www.ptable.com/

periodic table

Thanks to @ICTmagic (Martin Burrett) for the link (and check out his site for more!)

If you like this, you might also want to check out Web Elements, ChemiCool and the Periodic Table of Videos. You could also play this Periodic Table Game.