Stephanie's Timelineeee:)

  • 300


    Said matter was made of invisible particles called atoms
  • John Dalton

    John Dalton
    Propoaed an atomic theory with spherical solid masses in motion.
  • JJ Thompson

    JJ Thompson
    Described the atom as a ball of positive charge containing a number of electrons. Discovery of electron.
  • Ernest Rutherford

    Ernest Rutherford
    Used his "gold foil" experiment to determine that the nucleus of the atom is very dense and had a positive charge. Thus, discovering the proton. He also assumed that the electons were outside the nucleus of the atom.
  • Neils Bohr

    Neils Bohr
    Explained the atomic structure of the atom as "successive orbital shells of electrons." Model known as the Bohr Plalnetary Model.
  • Cockcroft and Walton

    Cockcroft and Walton
    Split the atom.
  • Schrodinger

    Identified the electron cloud model as the probable location of moving elecrtons.
  • Chadwick

    Discovered a particle within the nucleus that has a mass similar to that of a proton. Thus, he is credited with discovering the neutron.
  • Build atoic bomb

    Build atoic bomb
    Bomb was dropped on Japan to end World War 2.
  • First underground nuclear test

    First underground nuclear test
    The first underground nuclear test, code named Rainier, 1.7 kilitons.
  • Worst neclear power plant accident

    Worst neclear power plant accident
    The most serious in the United States commercial nuclear power plant operating history, even though it led to no deaths or injuries to workers in the plant or anywhere near it.