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  • Democritus stated that everything are made up of very small things which he called " Atomos " which meant indivisible
  • John Dalton created his atomic theory that sates atoms are the smallest unit of matter
  • J.J Thomson with the help of his invention the Cathode Ray Tube, discovered the electron and the proton which was sub atomic, thus disproving John Dalton's atomic theory
  • Ernest Rutherford's model describes the atom as a dense, positively charged core called a nucleus surrounded by negative charges which were electrons
  • Niels Bohr discovered the energy levels where electrons can be found
  • James Chadwick discovered the neutron
  • The modern atomic model describes the atom as a particle with a dense center with a cloud surrounding it. The cloud is where the electrons can be found
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