Atomic Model Timeline

Timeline created by leekuh
  • Period: to

    Atomic Model Timeline

  • Solid Sphere - John Dalton

    Solid Sphere - John Dalton
    All matter is composed of atoms
    Atoms cannot be made or destroyed
    All atoms of the same element are identical
    Different elements have different types of atoms
    Chemical reactions occur when atoms are rearranged
    Compounds are formed from atoms of the constituent elements.
  • Plum Pudding - JJ Thomson

    Plum Pudding - JJ Thomson
    Thomson publishes his discovery of a sub atomic particle common to all matter. When investigating cathode rays using a highly evacuated discharge tube he was able to use the calculated velocity and deflection of the beam to calculate the ratio of electric charge to mass of the cathode ray.
  • Albert Einstein

    Albert Einstein
    Proposed the quantum of light in which he states that light
    behaves like a particle but also has a wave nature, giving it
    a dual nature. Stated the equivalence of energy and mass
    through the theory of special relativity.
  • Planetary Model - Ernest Rutherford

    Planetary Model - Ernest Rutherford
    Rutherford publishes his atomic theory describing the atom as having a central positive nucleus surrounded by negative orbiting electrons. This model suggested that most of the mass of the atom was contained in the small nucleus, and that the rest of the atom was mostly empty space.
  • Bohr Model - Neils Bohr

    Bohr Model - Neils Bohr
    Bohr applies quantum theory to Rutherford's atomic structure by assuming that electrons travel in stationary orbits defined by their angular momentum. This led to the calculation of possible energy levels for these orbits and the postulation that the emission of light occurs when an electron moves into a lower energy orbit.
  • Electron Cloud Model - Erwin Schrodinger

    Electron Cloud Model - Erwin Schrodinger
    The Electron Cloud Model consisted of a dense nucleus surrounded by a cloud of electrons at various levels in orbitals.
  • Otto Hahn

    Otto Hahn
    Found that when Uranium is bombarded by neutrons it produces smaller nuclei roughly half the size of the original Uranium nucleus.
  • Atomic Bomb

    Atomic Bomb
    A type of bomb in which the energy is provided by nuclear fission. Uranium-235 and plutonium-239 are the isotopes most commonly used in atomic bombs.
  • Carbon Dating

    Carbon Dating
    The determination of the age of an organic object from the relative proportions of the carbon isotopes carbon-12 and carbon-14 in it.
  • Glen Seaborg

    Glen Seaborg
    Succeeded in making man-made elements.
  • Murray Gell-Mann and George Zweig

    Murray Gell-Mann and George Zweig
    Suggested the idea of quarks called up, down, or strange,
    composed of mesons and baryons, with spin 0.5 and
    electric charges of 2/3, -1/3, and -1/3 respectively.