Atomic Time Line

By gar9946
  • 400


    Democritus found the atom. all atoms are invisible, atom derives from atomos. Atomos is greek for invisible.
  • Anoine Lovoisier

    Law of Conservation of Mass, discovered mass and that it is the same in different forms. He also helped develop the metric system.
  • Law of Conservation of Mass

    Established by french chemist Antoine Lavoisier, states that mass is neither created or destroyed in any ordianary chemical reaction.
  • John Dalton

    He proposed atomic theory, with spherical solid masses in motion. Atoms can't be made or destroyed.
  • Dmitri Mendeleev

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

    He descovered the electron, he described atoms as ball or positive charge containing a number of electrons.
  • Robert Millikan

    Credited with measuring the charge of an electron and the oil drop experiment.
  • Cathode Raytube

    Karl Ferdinand Brain invents Cathode Raytube, forerner for radar and ratio tubes.
  • Plum Pudding Model

    Electrons surround positive charge.
  • Ernest Rutherford

    Conducted gold foil experiment; atoms are mainly open space with small hard nucleas in center.
  • Electon Cloud Model

    Modern day model of an electron cloud.
  • Neils Bohr

    Credited with "Bohr Planetary Model" and theory that electrons travel in specific planes.
  • Henry Moseley

    Sorted elements based off of their atomic number instead of atomic mass.
  • Quantum Mechanical Model

    Modern day model of an atom.
  • Erwin Schroclinger

    credited with mathmatically showing where electrons are in an atom.
  • James Chadwick

    Is credited with the discovery of the neutron.