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

By Dan33
  • 300 BCE

    Democriticus

    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

  • Sources:

    http://www.abcte.org/files/previews/chemistry/s1_p6.html
    bozemanscience.com
    atomictimeline.net
    nobeliefs.com
    https://atomictimeline.net/
    http://www.softschools.com/timelines/atomic_theory_timeline/95/
    https://prezi.com/skin6wx2a7fm/atomic-theory-timeline/
    https://www.preceden.com/timelines/36919-atomic-model-timeline