Atomic theory

  • 460 BCE

    Democritus

    one of the first to discover the atomic theory, came up with the 1st atomic model.
  • Dalton

    Proposed that all matter is composed of atoms
    Billiard ball model
  • Chadwick

    tried to see how much charge an electron has. oil drop experiment
  • Dalton

    discovered the electron experimenting with crookes
    plum pudding model
  • Rutherford

    Over turned Thomson´s model and discovered the radio active element plum pudding model (motified)
  • Bohr

    Proposed for the hydrogen atom based on Quantun structure of solar system

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