Periodic Table
by Bret Victor

It's a Periodic Table of the Elements. It's an NDA. Click on an element, and see its full name and atomic weight. Elementary, my dear chem student.

To install Periodic Table, put it in your System:Desk.Accs folder and reboot, or launch it with IR.

Atomic weights are given in grams per mole, and weights in parentheses are those of the most stable isotope.