Links posted on June 25, 2006
A scale model of the hydrogen atom This guy has put together a scaled image showing how much space an electron and proton take up within the hydrogen atom, and how much empty space there is. I'm guessing that they're doing this by taking their E&M cross sections, dividing by pi and taking a square root to get a radius, 'cause I'm a little unsure on how else to make any sense of an "electron radius", but still, interesting to think about