7th Period Melissa Ramos and Jonah Rempel Atomic Theory

Timeline created by ram6948
  • 300

    Democritus 300 BC

    Democritus 300 BC
    philosopher who formulated an atomic theory for the universe
  • Antoine Lavoisier

    Antoine Lavoisier
    Discovery of the makeup of water, the discovery of combustion and resperation all as a function of oxygen.
  • Law of Conservation of Mass

    Law of Conservation of Mass
    A fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system.
  • John Dalton

    John Dalton
    He is best known for his pioneering work in the development of modern atomic theory, and his research into colour blindness.
  • Dalton's Atomic Theory

    Dalton's Atomic Theory
  • Dmitri Mendeleev

    Dmitri Mendeleev
    Was the developer of the periodic table.
  • Cathode Ray Tube

    Cathode Ray Tube
    Demonstrated the influence of a magnetic field to the
    electron beam. The visible beam appears on the aluminum sheet covered with phosphor, will bent away from the center when a magnet is held near the tube.
  • J.J Thomson

    J.J Thomson
    He discovered the electron in 1897. He received the Nobel Prize in Physics in 1906.
  • Plum Pudding Atomic Model

    Plum Pudding Atomic Model
    J.J Thomson observed that electrons floating freely in an atom, much like negatively-charged plums surrounded by positively-charged pudding.
  • Robert Millikan

    Robert Millikan
    Was an American experimental physicist honored with the Nobel Prize for Physics in 1923 for his measurement of the elementary electronic charge and for his work on the photoelectric effect.
  • Rutherford Model

    Rutherford Model
  • Henry Moseley

    Henry Moseley
    developed the application of X-ray spectra to study atomic structure; Moseley's discoveries resulted in a more accurate positioning of elements in the Periodic Table by closer determination of atomic numbers.
  • Bohr Planetary

    Bohr Planetary
    The "planetary model" of the atom illustrated in the adjacent figure is used as a symbol for atomic energy . In the Bohr Model the neutrons and protons occupy a dense central region called the nucleus, and the electrons orbit the nucleus much like planets orbiting the Sun.
  • Niels Bohr

    Niels Bohr
    came up with a revolutionary theory on atomic structures and radiation emission
  • Gold Foil Experiment

    Gold Foil Experiment
    The experiment was believed that the mass of an atom was spread evenly throughout the atom. However the experiment proved that there is instead a small, dense, positively charged nucleus surrounded by mostly empty space and very small, negatively charged electrons
  • Erwin Schrodinger

    Erwin Schrodinger
    In Niels Bohr's theory of the atom, the electrons absorb and emit radiation of fixed wavelengths when jumping between the fixed orbits around a nucleus. The theory gave a good description of the spectrum from the hydrogen atom, but must be further developed for more complicated atoms and molecules.
  • Quantum Mechanical Model

    Quantum Mechanical Model
    model is based on mathematics. Although it is more difficult to understand than the Bohr model, it can be used to explain observations made on complex atoms.
  • Ernest Rutherford

    Ernest Rutherford
    became known as the father of nuclear physics. He is considered the greatest experimentalist since Michael Faraday.
  • James Chadwick

    James Chadwick
    discovered the neutron
  • Electron Cloud Model

    Electron Cloud Model
    an atom model wherein electrons are no longer depicted as particles moving around the nucleus in a fixed orbit