Atomic Theory Timeline (Click on the "list" button on the bottom for better viewing)

By Dan33
  • 300 BCE


    Proposed that everything in the world is made out of small particles called atoms
  • Period: 300 BCE to

    Atomic Theory

  • John Dalton

    John Dalton
    Proposed the solid Sphere model
  • Solid Sphere Model

    Solid Sphere Model
  • Amedeo Avogadro

    Amedeo Avogadro
    Had a hypothesis of: Under the same conditions and under equal volumes of gases, the amount of particles will be the same.
  • Dmitri Mendeleev

    Dmitri Mendeleev
    Created the periodic table
  • Max Planck

    Max Planck
    Planck made the assumption that energy was made of individual units, or quanta. Which made the foundation for today's quantum theory.
  • JJ Thompson

    JJ Thompson
    Proposed the Plum Pudding model, discovered the electron.
  • Plum Pudding Model

    Plum Pudding Model
  • Albert Einstein

    Albert Einstein
    Proposed the Photoelectric Effect which states that when light of a certain frequency shines on a metal, electrons are emitted.
  • Hans Geiger

    Hans Geiger
    Developed Geiger Muller Tube, part of an instrument used to measure the amount of iodizing ion radiations
  • Ernest Rutherford

    Ernest Rutherford
    Discovered the nucleus, proposed the nuclear model
  • Planetary Model

    Planetary Model
  • Nuclear Model

    Nuclear Model
  • Niels Bohr

    Niels Bohr
    Proposed the planetary model in which an atom contained a very small charged nucleus orbited by electrons. Niels Bohr applied Max Planck’s quantum theory to the Rutherford model to come up with his famous Bohr model of the atom.
  • Louis De Broglie

    Louis De Broglie
    Had a hypothesis of: If waves can behave like particles, particles can behave like waves.
  • Erwin Schrodinger

    Erwin Schrodinger
    Schrodinger used equations to describe the chance of finding an electron in a certain position.This led to the creation of quantum mechanical model of the atom.
  • Ernest Marsden

    Ernest Marsden
    Contributed to the Rutherford's atomic model while experimenting with alpha particles by finding hints to the existence of neutrons.
  • Quantum Mechanical Model

    Quantum Mechanical Model
  • Electron Cloud Model

    Electron Cloud Model
  • Werner Heisenberg

    Werner Heisenberg
    Heisenberg's uncertanity principle: Its impossible to know both position and velocity of an electron at the same time.
  • James Chadwick

    James Chadwick
    Discovered the Neutron