Atoms Timeline project

  • John Dalton

    John Dalton
    The one who came up with the theory that every thing is made up of atoms was nothing less that John Dalton. He claimed that hydrogen, oxigen and nitrogen are made of atoms. After publishing his theory it was accepted imediately.
  • Daltons Atomic Model

    Daltons Atomic Model
    He claimed what Democritus claimed many years ago about things being formed from smaller objects. In this model it is seen that only the "atom" was known.
  • William Crookes

    William Crookes
    The "Crookes tube" was named after him, he studied the properties of electrons in vaccumes with the fact that the magnetic field causes a deflection of the emission. He mentioned the "fourth state" to be when the tube was filled with matter.
    He was honored becuase he named the space near the cathode in low pressure "Crookes dark space"
  • J.J. Thomson

    J.J. Thomson
    He was the one who discovered the electrons. He made his experimentation by sudying the nature of electric discharge using a high-vaccum cathode-ray tube. http//
  • J.J. Thomson's Plum Pudding Atomic Model

    J.J. Thomson's Plum Pudding Atomic Model
    In this model the atom is composed of electrons that are surrounded by a positive charge to balance the electrons.
  • Ernest Rutherford

    Ernest Rutherford
    He was the one who discovered the atomic nucleus and he also was the one who developed a model of the atom which was similar to the solar system
    Years before he was the one to find that all of the known radioactive elements have two kids of radiation "positively and negatively charged, or alpha and beta" he also found out about the "half-life" in which elements decay to the point of becoming stable.
  • Gold Foil Experiment (Rutherford)

    Rutherford shot a ray of alpha particles through a thing gold foil. with this experiment he proved that the atom is made up mostly of empty space except for the nucleus which has the most mass in the atom.
  • Rutherford Atomic Model

    Rutherford Atomic Model
    This model was proving the "Plum Pudding model" wrong and it also sugested that there was a concentratiion of charge in the center later on this would be called the nucleus.
  • Neils Bohr

    Neils Bohr
    He is the one called the "father of atomic structure" , he studied all the reaserch done by J.J. Thomson and also Rutherfords's. He then devolped his theory in which he described an atom as a "miniature solar system" which had electron revolving arround a heavy nucelus.
  • Bohr Atomic Model

    Bohr Atomic Model
    The atom is represented as a small positively charged nucleus that are surrounded by electrons that travel in a circular pattern around the nucelus. This is similar to the solar system. In this model electrostatic forces are the force of attraction. httpj://
  • Schrodinger's Quantum Mechanical Model

    Schrodinger's Quantum Mechanical Model
    It uses a complex shapes of orbitals, according to the theory it is imposible to know the exact position of an electron at a certain time and moment. There are four quantum numbers which are used to explain the characteristics of the electrons.
  • James Chadwick

    James Chadwick
    James Chadwick is the great mind that proved the existence of the "Neutrons" the elemntary particles that lack a electrical charge.