History of the Atom Timeline

Timeline created by Valeria K
  • John Dalton

    John Dalton
    He was an English chemist, physicist, meteorologist. he is known because of his ideas in developing of modern atomic theory. He proposed the atomic theory, with spherical solid atoms, they are based on measurable properties of mass.
  • Dalton's Model

    Dalton's Model
    He came up with this Atomic theory as a final result of his investigation into gases. Something that he discovered is that certain gases can only be combined in certain proportions, even if two different compounds shared same element or group elements.
  • William Crooke

    William Crooke
    He is a British physcist and chemist and he is know because of his discovery of the elemet thallium and for the cathode-ray study. He is a basic in the development of atomic phyiscs.
  • Quantum Mechanical Model

    Quantum Mechanical Model
    This is based on mathematics. This theory says that matter has properties associated with the waves. Based on this theory or according to this theory it is impossible to have an idea of the exact position of an electron. Also known as Uncertainty Principle.
  • J.J Thomson

    J.J Thomson
    He is a British physicst. In the year of the 1897, he showed what cathode rays were composed of, previosuly unknown negatively charged particle, and it is credited with the identification of the electron.
  • JJ Thomson's Model (Plum Pudding Atomic Model)

    JJ Thomson's Model (Plum Pudding Atomic Model)
    What he discovered is the electron. A atom made thousand electrons would also have a very high negative electric charge and electrons must be balanced sort of postitive charges.
  • Ernest Rutherford

    Ernest Rutherford
    He is a chemist and a physicist. He is known as the father of nuclear physics. He considered the greatest experimentalist.
  • Rutherford Model

    Rutherford Model
    This model can also be called nuclear atom, or planetary model of the atom. What this model describes is that it describes the atom as a positive charged core called nucleus, tiny ,dense, in which all mass is concentrated.
  • James Chadwick

    James Chadwick
    He is an English physicist who won a Nobel Prize in the year of 1935 in physics because of his tremendous discovery of the neutron in the year of 1932. During the Manhattan Project during World War II, he was the head of the British scienist who worked on it.
  • Niels Bohr

    Niels Bohr
    He developed an explanatory method of the atomic structure. That it underlies regularities of the periodic table of elements. He created an atomic model and it had atoms built up of progressive orbital shells of electrons.
  • Bohr Model

    Bohr Model
    This familiar as the planetary model. It models the nutrons and protons it symbolized as red and blue balls. it occupy dense central region called nucleus. Electrons orbit the nucleus.