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Atomic Theory Timeline

By Door_Matt
  • 400

    Democritus

    Democritus
    States that everything is composed of atoms

  • John Dalton

    John Dalton
    Created the Atomic Theory
    1. Elements are made of atoms
    2. Atoms of a given element are identical
    3. Atoms can't be created or destroyed
    4. Atoms form chemical compounds by combining with other elements
    5. Atoms are combined, seperated, or rearranged in chemical reactions

  • Albert Einstein

    Albert Einstein
    Photoelectric effect stating that electrons can be released from atoms by means of light absorption. Also states that atoms emit photons.

  • Joseph John Thompson

    Joseph John Thompson
    Discovered the electron with his expirements using cathode rays. Created the Plum Pudding model of the atom.

  • Ernest Rutherford

    Ernest Rutherford
    First to reveal the existence of the nucleus using the gold foil expirement. He also disproved the Plum Pudding model.

  • Robert Milikman

    Robert Milikman
    Discovered the charge of an electron using an oil drop expirement. Created the molecular orbital theory.

  • Niels Bohr

    Niels Bohr
    Created the model for a hydrogen atom depicting the nucleus of the atom having a positive charge with electrons orbiting around it in specific patterns. Also known as the planetary model.

  • Louis De Broglie

    Louis De Broglie
    States that subatomic particles are mor like waves than particles. Specifically electrons

  • Wolfgang Pauli

    Wolfgang Pauli
    States that 2 electrons can't occupy the same quantam space at the same time. Helped create the nuclear shell model.

  • Erwin Schrodinger

    Erwin Schrodinger
    Created the electron cloud model using equations that deal with electrons and waves.

  • Werner Heisenberg

    Werner Heisenberg
    Created the Uncertainity Principle. Stating that it is impossible to mathematically find the momentum of an electron.

  • James Chadwick

    James Chadwick
    Discovers the neutron. Neutrally charged particle.

  • Citations

    (n.d.). Retrieved from http://reich-chemistry.wikispaces.com/reich.atomichistorytimeline.fall.2011 Walker , J. Atoms. Retrieved from http://www.nobeliefs.com/atom.htm (n.d.). Retrieved from http://en.wikipedia.org/wiki/Pauli_exclusion_principle http://en.wikipedia.org/wiki/Louis_de_Broglie http://osulibrary.oregonstate.edu/specialcollections/coll/pauling/bond/people/heisenberg.html