Learning the periodic table of Elements has always been a bit of a bore for many but I have put together a few websites that might make this a little more enticing to your students. there is an excellentiPad appthat sparked my memory for this post but here are a few web based alternatives to try.
Touchspin Periodic Table- Very Easy to navigate with all the key components.
The Visual Periodic table- Flash based Table
The Dynamic Table- Nice and large great for Inteacitve Whiteboards
Web Elements- Not so Kid friendly but rich in content for older students.
I am sure there are plenty of others out there and I would love to hear about them.