Periodic Table Element Describer
The Project
It only explains Hydrogen, Helium, Lithium, Beryllium, Boron, Carbon, Nitrogen, Oxygen, Fluorine, Neon and Sodium, unfortunately. Luckily, it can help with Science/Periodic Table! You basically type in the symbol, press enter, and then, well, it gives you the information about it. But it unfortunately only works with the elements shown above.