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- - - - Dalton thought that atoms looked like billiard balls from pool, and theorized that matter was made up of many tiny particles called atoms.
  - - - J.J Thomson's atomic model was a sphere embedded with electrons. The sphere had positive charges throughout it and negatively charged particles were also scattered across this model.
  - - - Ernest Rutherford envisioned the atom as a miniature solar system, with electrons orbiting around a massive nucleus, and as mostly empty space, with the nucleus occupying only a very small part of the atom.
  - - - Bohr proposed that electrons travel in definite orbits around the nucleus.
  - - - This modern atomic theory described the electronic structure of the atom as the probability of finding electrons within certain regions of space.
  - - - He held that atom is tiny, hard, and uncuttable.