Structure of the atom

By Bryce_Niemeyer
  • 460 BCE

    Democritus

    Democritus proposed that all matter is made up of small particles. Democritus had very little evidence to prove this.

  • John Dalton

    John Dalton proposed that elements were identical and had the same mass and that compounds were atoms from different elements combined together.

  • Michael Faraday

    Faraday developed the two laws of electrochemistry.

  • Dmitri Mendeleev

    Dmitri Mendeleev created the periodic table.

  • Wilhelm Roentgen

    Roentgen discovered x-rays.

  • J.J Thomson

    J.J. Thomson determined the charge to mass ratio of electrons.

  • Cathode Ray Experiment

    It showed the the existence of electrons. J.J Thomson helped made this experiment. They did this using a cathode ray tube

  • Ernest Rutherford

    Ernest Rutherford discovered alpha, beta, and gamma rays in radiation.

  • Gold Foil experiment

    Rutherford's Gold Foil Experiment proved the existence of a small massive center to atoms, or as we know as the nucleus.

  • Marie Sklodowska Curie

    Curie discovered radium and polonium

  • Millikan OIl Drop Experiment

    Millikan OIl Drop Experiment
    This experiment measured the elementary electric charge

  • H.G.J. Moseley

    Moseley discovered that the number of protons in an element determines its atomic number.

  • Niels Bohr

    Bohr proposed an atomic structure theory that stated the outer orbit of an atom could hold more electrons than the inner orbit.

  • Electron Cloud Model

    Electron Cloud Model
    It consisted of a dense nucleus surrounded by a cloud of electrons at various levels in orbitals.

  • Enrico Fermi

    Fermi created the first man-made nuclear reactor.