Describe the behavior of an electron.
Electrons have properties of both particles and waves, so they can collide with other particles and be diffracted like light.
http://en.wikipedia.org/wiki/Electron
Electrons can dwell at various energy levels within an atom. When electrons move from one energy level to another, they either absorb or emit a photon. Electrons in different atoms have different energies associated with their energy level transitions. Electrons are often torn loose from their parent atoms. Such "free electron" can be accelerated, because of the electron's charge, to very high speeds and energies by electrical and magnetic fields.
http://www.windows2universe.org/physical_science/physics/atom_particle/electron.html
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