Atomic Model

By petermaltese
  • 400

    Aristotole

    Aristotle’s theory made a great generalization of all matter of the four elements: fire, water, earth, and air. He also believed that there were four qualities to these elements: dryness, hotness, coldness, and moistness.
  • 460

    Democritus

    He created the first atomic model

  • John Dalton

    Proposed his modern theory of the atom. He based it upon :1. Matter is made up of atoms that are indivisible and indestructible. 2. All atoms of an element are identical. 3. Atoms of different elements have different weights and different chemical properties. 4. Atoms of different elements combine in simple whole numbers to form compounds. 5. Atoms cannot be created or destroyed. When a compound decomposes, the atoms are recovered unchanged.

  • William Conrad Roentgen

    He discovered x-rays while using cathode-ray tubes. He found that x-rays could pass through solid objects.

  • J.J.Thomson

    He discovered the Plum Pudding Model of the atom

  • Hantaro Nagaoka

    Nagaoka developed an early, incorrect "planetary model" of the atom.
    The model was based on the stability of Saturn's rings.

  • Ernest Marsden

    He discovered the existence of the atomic nucleus. He discovered this by using the Gold Foil Experiment or the Rutherford Experiment.

  • Ernest Rutherford

    Theorized that atoms have their positive charge concentrated in a very small nucleus. He pioneered the Rutherford model of the atom, with his discovery and interpretation of Rutherford scattering in his gold foil experiment.

  • Niels Bohr

    Presented a picture of an atomic structure. He passed on to a study of the structure of atoms based on Rutherford's discovery of the atomic nucleus. (This lead him to the picture of his atom.)

  • Henry Moseley

    Moseley's law advanced atomic physics. He did this by providing the first experimental evidence of Niels Bohr's theory.

  • Louis de Brogile

    He developed a theisis of important findings. It served as the basis for developing the general theory now known by the name of wave mechanics, a theory which has utterly transformed our knowledge of physical phenomena on the atomic scale.

  • Erwin Schrodinger

    He generated a mathematical model for the distribution of electrons in an atom. He combined the equations for the behavior of waves with the Louis de Broglie equation.

  • James Chadwick

    He proved the existence of neutrons. He heard of a new method of detecting particles emitted by radioactive elements developed by Irene Joliot-Curie.