If this picture were drawn to scale:

• And if the protons and neutrons were a centimeter in diameter;
• Then the electrons and quarks would be less than the diameter of a hair; and
• The entire atom's diameter would be greater than the length of 30 football fields!

In addition, all the particles (protons, neutrons, quarks, and electrons) are constantly in motion.

If you are using Netscape and are on a fast network, you can see an animated atom model.