Remember to look at the units for each value. CHEMystery Periodic Table of the Elements Has some history of the general sections, good numerical data of each element. This site has quite a variety of topics. The reference section has an index which may help you find specific topics quicker. This site shows how to do problems on a variety of topics.
Some sections are still under construction.
If you can't find a chemistry topic here, you didn't really need to know about it. I haven't had time to go through all of them, but see what you can find.