Atomic Structure Timeline

By 16jthorn

  • Democritus

    In 460 BC, Democritus thought that matter was made of ever smaller pieces that ended at some point. Democritus called these particles atoms.

  • John Dalton

    John Dalton created the atomic theory.

  • JJ Thomson

    Thomson discovered the electron in 1897 and created the "plum pudding" model in 1904.

  • Albert Einstein

    Albert Einstein was the first to actually prove the existence of atoms.

  • Robert Millikan

    Robert Millikan measured the charge of a single electron using an oil drop experiment.

  • Ernest Rutherford

    Along with Hans Geiger and Ernest Marsden, Rutherford caused alpha particles to pass through a sheet of gold foil. Some of the particles were measured to be deflected and this led Rutherford to formulate the Rutherford model.

  • Niels Bohr

    Niels Bohr proposed that an atom is a small particle with a positively charged nucleus that is orbitted by electrons.

  • Louis de Broglie

    Louis de Broglie set the base for wave mechanics.

  • Wolfgang Pauli

    Wolfgang Pauli contributed the Pauli exclusion principle to quantom mechanics.

  • Werner Heisenberg

    Werner Heisenberg was a key creator of quantom mechanics. In 1927 he published his uncertainty principle.

  • Erwin Schrodinger

    Schrodinger contributed the Schrodinger equation to quantom mechanics.

  • James Chadwick

    James discovered the atomic number and neutron. He also helped discover the nuclear bomb.

  • Works Cited

    "Albert Einstein and the Most Elemental Atomic Theory." ANS Nuclear Cafe. N.p., n.d. Web. 22 Sept. 2013. "Albert Einstein." Wikipedia. Wikimedia Foundation, 19 Sept. 2013. Web. 22 Sept. 2013. "Ernest Rutherford." Wikipedia. Wikimedia Foundation, 20 Sept. 2013. Web. 22 Sept. 2013. "Erwin Schrödinger." Wikipedia. Wikimedia Foundation, 19 Sept. 2013. Web. 22 Sept. 2013. "History of Atoms." History of Atoms. N.p., n.d. Web. 22 Sept. 2013. "John Dalton." Wikipedia. Wikimedia Foundation, 1

  • Works Cited Cont.

    "Louis De Broglie." Wikipedia. Wikimedia Foundation, 19 Sept. 2013. Web. 22 Sept. 2013.
    "Niels Bohr: Biography & Atomic Theory." LiveScience.com. N.p., n.d. Web. 22 Sept. 2013.
    "Plum Pudding Model." Wikipedia. Wikimedia Foundation, 18 Sept. 2013. Web. 22 Sept. 2013.
    "Plum Pudding Model." Wikipedia. Wikimedia Foundation, 18 Sept. 2013. Web. 22 Sept. 2013.
    "Robert Andrews Millikan." Wikipedia. Wikimedia Foundation, 17 Sept. 2013. Web. 22 Sept. 2013.
    "Werner Heisenberg." Wikipedia. Wikimedia Founda