history of an atom

By Zachary.childs98
  • Period: 225 to

    history of an atom

  • 400

    Aristotle 400B.C.

    Aristotle did not believe in the atomic theory and he taught so otherwise. He thought that all materials on Earth were not made of atoms, but of the four elements, Earth, Fire, Water, and Air. He believed all substances were made of small amounts of these four elements of matter. Most people followed Aristotle’s idea, causing Democritus’ idea- which was that all substances on Earth where made of small particles called atoms- to be over looked for about 2,000 years! Aristotle's view was finally p
  • 460

    Democritus 460 B.C.

    1.All matter consists of invisible particles called atoms.
    2. Atoms are indestructible.
    3. Atoms are solid but invisible.
    4. Atoms are homogenous.
    5. Atoms differ in size, shape, mass, position, and arrangement.
    ->Solids are made of small, pointy atoms.
    ->Liquids are made of large, round atoms.
    ->Oils are made of very fine, small atoms that can easily slip past each other.

  • Coulomb

    in physics, law stating that the electrostatic force between two charged bodies is proportional to the product of the amount of charge on the bodies divided by the square of the distance between them. If the bodies are oppositely charged, one positive and one negative, they are attracted toward one another

  • Dalton

    John Dalton was seriously interested in meteorology for the longest time. He published Meteorological Observations which was daily weather observations. He did these observations from 1787 until he died in 1844. His serious interest in meteorology led him to his view of atomism. 

  • Thompson

  • Planck

  • Einstien

  • Millikan

  • Rutherford

  • Bohr

    In 1913, he passed on to a study of the structure of atoms on the basis of Rutherford's discovery of the atomic nucleus, and since 1920 (until his death in 1962) he was at the head of the Institute for Theoretical Physics, established for him at that university. During his work on the atomic structure, he succeeded in working out and presenting a picture of atomic structure that, with later improvements, still serves as clarification on the physical and chemical properties of the elements.

  • Schroedinger

  • Chadwick

    James Chadwick discovered the neutron using evidence collected by Irene Joliot-Curie, who discovered that when beryllium was bombarded with positively charged alpha particles a beam with a high penetrating power was created. James Chadwick discoverd that this beam was not deflected by either electric or magnetic fields, meaning it contained neutral particles- neutrons. Neutrons were found to have the same mass as protons which accounted for more of the mass of the atom