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  • Democritus (Ancient Greece): matter is made of smaller versions
  • Atomos = indivisible
  • Matter cannot be created nor destroyed
  • John Dalton (1880's): All matter made of atoms, like SPHERES
  • JJ Thompson (1880's): Used cathode ray to discover ELECTRONS
  • The PLUM PUDDING model!
  • Ernest Rughetrford (1909): Gold foil experiment to discovered PROTONS and NUCLEUS
  • Nucleus has POSITIVE PROTONS
  • Electron Orbits Around Nucleus, like the planets
  • Niels Bohr (1911): Calculated and created the orbital theory of electrons
  • Werner Heisenberg (1950's): Proposed cloud theory to predict where electrons could be
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