Atomic Model

By Tarzan
  • Period: to

    Atomic Model Timeline

  • John Dalton Atomic Model

    John Dalton Atomic Model
    English chemist who proposed the Atomic Theory which
    stated that all matter was composed of small indivisible
    particles called atoms. These atoms possess unique
    characteristics and weight for different elembets.
    He also stated that three types of atoms exist: simple
    (elements), compound (simple molecules), and complex
    (complex molecules).
  • Crookes

    Developed the Crookes tube and in it produced cathode
    rays for the first time. He also invented the radiometer and
  • Becquerel

    A French physicist who found that rays coming from a
    uranium ore affected a photographic plate like X-rays did.
    The rays were not from an external source and were more
    powerful than those from a sample of pure uranium. His
    experiment led to the discovery of natural radioactivity.
  • J.J Thompson

    J.J Thompson
    First to measure the electron. Developed the
    plum-pudding model of the atom. Describes the atom as a
    slightly positive sphere with small electrons inside.
  • Albert Einstein

    Albert Einstein
    Proposed the quantum of light in which he states that light
    behaves like a particle but also has a wave nature, giving it
    a dual nature. Stated the equivalence of energy and mass
    through the theory of special relativity.
  • Robert Millikan

    Robert Millikan
    Discovered the charge of an electron with his oil drop
  • Ernest Rutherford

    Ernest Rutherford
    Inferred a small, dense, positively-charged nucleus as the
    result of the alpha particle scattering gold foil experiment.
  • Neils Bohr

    Neils Bohr
    A Danish physicist who stated that electrons could only
    orbit the nucleus in successively larger orbits around the
    nucleus. The outer orbits could hold more electrons. The
    electrons in the outermost shell determine the properties of
    the atom. He also inferred that when an electron moves from
    an outer orbit to an inner orbit it emits a quantum of energy,
    a photon, in the form of light