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Timeline created by coreylaubach
  • 384

    Aristotle

    The most important Greek philosipher of his time introduced the theory of the atom.
  • Period:
    384
    to

    Time Line of the Atomic Theory

    starting from 384 B.C ending at 1932.
  • 442

    Democritus

    Greek philosipher, who developed the atomic theory of the universe. The Atomic theory created the principles of the concervation of energy and matter.
  • John Dalton

    Proposed the Atomic theory with solic spherical atoms based apon measurable properties of mass.
  • Henri Becquerel

    While studying the effect of x-rays on photographic phil, he discovered some chemicals give off very penetrating rays.
  • Marie & pierre

    French chemists that discovered the uranium rays. there experements eventually lead to connections with the Atom.
  • J.J Thompson

    created a model of the Atom.
    British chemest Joseph john Thompson discovered the electron in a series of experaments desighned to study the nature of electric discharge in a high-vacuume cathode-ray tube.
  • Robert Millikan

    American physicist, best known for his work in atomic physics and major science. He with the fundimental constituents of the universe, the forces they exert on one another, and the results produced by these forces.
  • Ernest Rutherford

    British physicist, who became a nobel laureate for the theory of the structure of the atom. He established the thought that the nucleous was very dense, very small ans posatively charged. He also assumed that the electrons were located outside the nucleus.
  • Neils Bohr

    Developed an explination of atomic structure that underlies regularities of the periodic tableof elements. His atomic model had atoms built up of successive shells of electrons.
  • James Chadwick

    Using alpha particles discovered a neutral atomic particlewith za mass close to a proton. Then discovered the neutron and measured the energy of the protons emerging from the hydrogen atoms.