Whether the electrons are very small or huge by comparison since the electron spins around the nucleous a billion or so times per second wouldn't centrifugal force send the electron zooming away from the atom or molecule? Unless as the article states the electrical forces here must be extremely powerful.
If one considers the bound electron to be orbiting around the nucleus of the atom, consider it is also moving at close to the speed of light. The difference in charge between the electron and the nucleus is the main thing keeping the electron bound to the atom.