Science Web Surf (8th Grade): Protons and Electrons

Part 1: Atoms, Elements and Molecules

http://education.jlab.org/qa/pen_number.html

Part 2: Charge it!

http://www.tulane.edu/~sanelson/eens211/crystal_chemistry.htm

Part 3: Sturcture of an Atom

http://www.nyu.edu/pages/mathmol/textbook/atoms.html