Atomic Model Timeline

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    Democritus's Atomic Model

    Democritus's Atomic Model
    Democritus had an idea of atoms but in a void.
  • Dalton's Atomic Model

    Dalton's Atomic Model
    Dalton believed that all matter is made out of atoms and that theya re invisible and indestructible.
  • Michael Faraday

    Michael Faraday
    Michael Faraday verified that electrical forced held together an atom.
  • J. Plucker

    J. Plucker
    Julius Plucker built one of the first gas discharge tubes also known as a cathode ray tube.
  • William Conrad Roentgen

    William Conrad Roentgen
    William discovered X-rays while using the cathode ray tube.
  • J.J Thomson

    J.J Thomson
    He discovered the Plum pudding model of the atom and he concluded that there are electrons around the atom surrounded by a positive charged area to blance out.
  • Hantaro Nagaoka

    Hantaro Nagaoka
    He discovered a planetary model of the atom based on saturn's rings but this model was incorrect.
  • Ernest Rutherford

    Ernest Rutherford
    Rutherford theorized that atoms have a small positive charge in a small nucleus. He tested this theory with the gold foil experiment and he came up with a new model.
  • Niels Bohr

    Niels Bohr
    He believed that outer orbitals could hold more electrons then inner orbitals. He also suggested that the outer orbitals determine the atom's chemical property.
  • Cockcroft & Walton

    Cockcroft & Walton
    They built an accelerator and bombarded lithium with protons to make alpha particles
  • Schrodinger

    Saw electrons as a continuous clouds and introduced wave mechanics as a mathmatical model of an atom.
  • Enrico Fermi

    Enrico Fermi
    He did the first controlled chain reaction releasing energy from the atom's nucleus.