Scientists that contributed to the model of the atom

  • 350

    Aristotle

    He thought that there were only 4 elements, fire, water, air, and earth. (Also BC)
  • 400

    Democritus

    Everything is made up of atoms (this is supposed to be in BC but I cant figure how to)
  • 500

    Parmenides

    He thought that everything was made up of blocks (supposed to be in BC)
  • John Dalton

  • JJ Thomson

    Discovered electrons existence but not details, cathode ray tube
  • Milikan

    Found charge and mass of electron, mass of atom
  • Gold Foil Experiment

    Shot alpha particles at gold foil. They should have gone straight through but some bounced off showing that there was a nucleus
  • Niels Bohr

    Electrons orbited in rings, could jump from orbit to orbit to emit energy
  • James Chadwick

    Discovered the nuetron
  • The manhattan project

    Nuclear research created atomic bomb for WWII, seperated the atom.