Atomic Theory Timeline

Timeline created by Esp7778
  • 300

    Demcritus

    Demcritus
    Democritus considered himself as the father of modern science. Claims that every atom physical but is geometrically, invisible.
  • Antoine Lavoisier

    Antoine Lavoisier
    A French chemist that considered himself the father of modern chemistry. Stating that "air" was responsible for combustion that could be the source of acidity.
  • Law of Conservation of Mass

    Law of Conservation of Mass
    Established by Antoine Lavoisier, and it states that, "Mass can neither be created nor destoyed in an ordinary chemical reaction".
  • John Dalton

    John Dalton
    Responsible for the basic atomic theory. Billiard Ball Model.
  • Dalton's Atomic Theory

    Dalton's Atomic Theory
    All matter is made of of atoms, and the atoms are indivisible and are industructable.
  • Dmitri Mendeleev

    Dmitri Mendeleev
    Created the Periodic Table. He believed that the the elements had some type of order.
  • Cathode Ray Tube

    Cathode Ray Tube
    A stream of electrons that leave negative cathode, in a discharge tube emitted by a heated filament in certain electron tubes.
  • JJ Thomson

    JJ Thomson
    Studied the beams of light that followed an electrical discharge in a high-vacuum tube. This research became a popular topic among physicists at the time because this was the nature of cathode rays and it was unclear until now.
  • Plum Pudding Atomic Model

    Plum Pudding Atomic Model
    Is an atom model brought up by JJ Thomson. As in a plum the "pudding" is the positively charged atoms and the "dotting" was the negatively charged atoms.
  • Robert Millikan

    Robert Millikan
    Used s source of x-rays to take out the electrons of the molecules out of the air. 1.59 x 10-19 C
  • Rutherford Model

    Rutherford Model
    Tested the hypothesis of JJ Thomson, and it showed that the mass of the atom was spread out through the whole atom.
  • Henry Moseley

    Henry Moseley
    Studied under Rutherford, and order the elements on the Periodic Table correctly and came closer to determine the actual number of the elements.
  • Bohr Planetary

    Bohr Planetary
    Was a theory of the atomic structure and it explains the spectrum of hydrogen atoms. Guessing that the electron orbited around the nucleus can happen only in certain energy states.
  • Niels Bohr

    Niels Bohr
    Assumed that the electrons traveled at a stationary movement.
  • Gold Foil Experiment

    The gold separates the alpha particles, and the deflection of the partcles went through at large angles. The closer they get the bigger the angles get.
  • Erwin Schrodinger

    Erwin Schrodinger
    He studies wave mechanics, and crucial understanding the spectrum of light.
  • Quantum Mechanical Model

    Quantum Mechanical Model
    Discovered facts about energy to propose his planetary model of the atom. The neutrons and protons are contained in a small, dense nucleus, which the electrons orbit in defined spherical orbits.
  • Ernest Rutherford

    Ernest Rutherford
    Describes the atomic theory by stating the nucleus has central positive protons surrounded by the neutrons.
  • James Chadwick

    James Chadwick
    Predicted that the atom would have neutrons.
  • Electron Cloud Model

    Electron Cloud Model
    Describes the atom as a cloud with floating protons, electrons, and neutrons.