Element 1.5.2

the author of this app says:

Finally, there is a periodic table of elements for the Pilot that offers a real user interface!

Element displays the periodic table just as you would like to see it. Elements can be selected via tapping them directly in the table, or by selecting them via their name, symbol, weight or atomic number.

For almost all the elements, data for 25 properties is available. And there's a very user-friendly interface!