Atomic Theory Timeline

Timeline created by kne1795
  • 300

    Democritus

    First person to propose the idea that matter was not infinitely divised. He believed matter was made up of tiny individual particles called atoms. He believed that atoms can not be created, destroyed, or further divided.
  • Period:
    300
    to

    Atomic Theory Time

    Here is the timeline in which the Atomic Theory was developed.
  • Antoine Lavosier

    French chemist whose persistance in percise experiments led to the law of conservation of mass. He was the first to announce that air was made up of two gases- oxygen an nitrogen.
  • Law of conservation of mass

    States that mass is neither created nor destroyed during a chemical reaction but is conserved.
  • John Dalton

    Discovered Atomic Theory.
  • Dalon's Atomic Theory

    Was based on the premise that the atoms of different elements could be distinguished by differences in their weights.
  • Dimitri Mendeleer

    Russian chemist who divised the original periodic table of the elements.
  • Cathode Ray Tube

    an electric current passed through a gas inside a sealed tube. The ray would bend away from a negative field.
  • J.J Thomson

    discovered the electron, a negatively charged particle more than two thousand times lighter than a hydrogen atom.
  • Plum Pudding Atomic Model

    an atom made of thousands of electrons would have a very high, negatively electric charge. This was not observed, as atoms are usually uncharged.