Change the number of protons, neutrons, and electrons and see what happens! I'll get the nucleus to work eventually. :P Just sharing it now just cause. If there are any glitches and whatnot please tell me in the comments :D
I got the idea for this from http://phet.colorado.edu/sims/html/build-an-atom/latest/build-an-atom_en.html (pretty much the same thing as this project). The element symbols and stuff from the periodic table are from m.kosmixmedia.com (just google imaged it and yeah so anyway)