Atomic Theory Time Line

By wyatt15
  • 492

    Democritus

    all things are made of tiny indestructable things called atoms.
  • Antoine lavoisier

    Law of consservation of mass Discovered mass and that it is the same in differnent forms. He also helped develope the metric system.
  • John dalton

    Daltons Atomic Theory: Atoms from differnt elements are different but can be identified by their wieght
  • Dmitri Mendeleev

    Created first periodic table. Later won a nobel peace prize for it.
  • J. J. Thomson

    Discovered the electron
  • Cathode Ray Tube

    Karl Ferdinand Brain invents cathode ray tube. Forernner for radar and radio tubes
  • Robert Millikan

    He is credited with measuring the charge of an electron and the oil drop expirement.
  • Ernst Rutherford

    conducted gold foil expirement: atom are mainly open space with small hard nucleas in center
  • Plum Pudding Atomic Model

    electrons surrond positive charge
  • Henry Moseley

    Sorted elements based off of their atomic number instead of atomic mass.
  • Niels Bohr

    credited with Bohr planetary model and theory that electrons travel in specific planes
  • Quantum mechanical Model

    Mondern day accepeted model of an atom.
  • Erwin Schrodinger

    Credited with mathmaticaly showing where electrons are in an atom.
  • James Chadwick

    James Chadwick is crdited with the discovery of the neutron.
  • Electron Cloud Model

    modern day model of an electron cloud.