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Atomic Models

By FL1N7
  • 460

    Democritus

    Democritus
    Democritus atomic model
    What: He created the first atomic model.
    How: His model of the atom depended on analogies from human senses. He tell that it is indivisible.

  • John Dalton

    John Dalton
    John Dalton atom modelWhat:Proposed his modern theory of the atom.
    How:He based it upon:
    1.All Matter is made up of atoms that are indivisible and indestructible.(Like Democritus)
    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.

  • J.J. Thomson

    J.J. Thomson
    J.J. Thomson atomic model
    What: He discovered the Plum Pudding Model of the atom.
    How: In J.J.'s model, the atom is composed of electrons surrounded by an area of positive charges to balance out the negative charges.
    Cathode Rays Experiment: The presence of a negatively charged particle: the electron. Cathode ray tubes pass electricity through a gas that is contained at a very low pressure.

  • Ernest Rutherford

    Ernest Rutherford
    Ernest Rutherford atomic modelWhat: Theorized that atoms have their positive charge concentrated in a very small nucleus.
    How: He pioneered the Rutherford model of the atom, with his discovery and interpretation of Rutherford scattering in his gold foil experiment.
    Gold Foil Experiment: Rutherford shot alpha(+) particles at a thin sheet of gold foil and observed the pattern of scatter of he particles.Most of the alpha particles passed.

  • Niels Bohr

    Niels Bohr
    Niels Bohr atomic model
    What: Presented a picture of an atomic structure.
    How: 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.)
    The electron in a hydrogen atom travels around the nucleus in a circular orbit. Problems with the Bohr Atom is only successful with the hydrogen atom.
  • Period: to

    Electron Cloud Model

    Electron Cloud Model
    Erwin Schrödinger What: He generated a mathematical model for the distribution of electrons in an atom.
    How: He combined the equations for the behavior of waves with the Louis de Broglie equation. As a result of continuing research throughout the 20th century, scientists today realize that energy leves are not neat, planet-like orbits around the nucleus of an atom.

  • Sources and Usefull Links

    http://www.timetoast.com/timelines/atomic-model-timeline--3
    http://www.inspiration.com/inspiration-science-examples
    https://www.youtube.com/watch?v=NSAgLvKOPLQ
    https://www.youtube.com/watch?v=Ux17dmd3hHU
    https://www.youtube.com/watch?v=QbWKF9uDF7w
    FMV Ayazğa Işık High School Science Department 2013-2014 Academic Year 9th Classes Chemistry Lecture Notes Unit 2 - Atom