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  • 465 B.C. Democritus proposed his atomic model
  • His Atomic Model
  • The Atom is a sphere
  • His Atomic Theory
  • Atoms are tiny, solid balls
  • 1808 - John Dalton presented his atomic model
  • His Atomic Model
  • Atom is like plum pudding positive particles: the pudding electrons: the raisins
  • 1904 - J.J. Thomson proposed the existence of electrons in his plum pudding model
  • His Atomic Model
  • 1911 - Through his gold foil experiment, Ernest Rutherford discovers the proton and neutron
  • The center of the atom: nucleus and protons Orbitting the center: electrons
  • Electrons move around the nucleus in orbits or shells
  • His Atomic Theory
  • 1913 - Niels Bohr modified Rutherford's model by adding orbits where electrons move around
  • A neutron contains no charges
  • Neutrons: The grey circles were added to Bohr's model
  • 1932 - James Chadwick discovered the neutron and added it to the atomic model
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