Development of the atomic structure


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  • I think that everything is made of small, hard particles called atomos.
  • Democritus
  • I believe that atoms are tiny solid balls and I proposed the 4 atomic theory statements.
  • John Dalton
  • I identified the electrons (-), proposed the existence of a + particle and made the raisin bun model.
  • J.J Thomson
  • I discovered that atoms have (+) particles in the center and are mostly empty space, I called the (+) particles protons and the center the nucleus
  • Ernest Rutherford
  • I believe that electrons move around the nucleus in specific layers or shells.
  • Niels Bohr
  • I found particles with no charge and called them neutrons.
  • James Chadwick
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