UPDATE: see this post for an update
I stumbled on this page one day that shows a scale model of an atom. It demonstrates the vast amount of empty space between the proton the electron that spins around it. By making the electron one pixel in size, that makes the proton 1,000 pixels wide and the space between it 50,000,000 pixels wide. If your monitor displays 72 pixels to the inch, then that works out to eleven miles – making it possibly the widest web page you’ll ever see!
See it for yourself!
http://www.phrenopolis.com/perspective/atom/
