Atomic Structure

By jatwell6197

  • Dalton

    Dalton
    Proposed an "atomic theory" with spherical solid atoms based upon measurable properties of mass.

  • JJ. Thompson

    JJ. Thompson
    Used a CRT to experimentally determine the charge to mass ratio (e/m) of an electron =1.759 x 10 8 coulombs/gram.
    Studied "canal rays" and found they were associated with the proton H +

  • Rutherford

    Rutherford
    Using alpha particles as atomic bullets, probed the atoms in a piece of thin (0.00006 cm) gold foil . He established that the nucleus was: very dense,very small and positively charged. He also assumed that the electrons were located outside the nucleus.

  • Bhor

    Bhor
    Developed an explanation of atomic structure that underlies regularities of the periodic table of elements. His atomic model had atoms built up of sucessive orbital shells of electrons.

  • Chadwick

    Chadwick
    Using alpha particles discovered a neutral atomic particle with a mass close to a proton. Thus was discovered the neutron.

  • The Modern Model

    The Modern Model
    Electrons are in constant motion around the nucleus, protons and neutrons jiggle within the nucleus, and quarks jiggle within the protons and neutrons.