Mrs.Holders time line gma

  • 300


    Matter is made up of individual invisible particles called atoms.
  • 300


    In first centyry BC the egytians declined in power from their great empire to dramaticly spireling downward.
  • John Dalton

    John Dalton
    Proposed atomic theory with spherical solid masses in motion.
  • Michael Faraday

    Michael Faraday
    Studied the effect of electricity on solutions, coined term "electrolysis" as a splitting of molecules with electricity, developed laws of electrolysis.
  • JJ Thompson

    JJ Thompson
    Described the atom as a ball of positive charged particles contaniting a number of electrons.
  • Ernest Rutherford

    Ernest Rutherford
    Used the gold foil expiriment to discover that the nucleous is very dense and has a positive charge.
  • Neils Bohr

    Neils Bohr
    Explained the atomic structure of the atom as succesive orbital shells of electrons
  • Cockcroft / Walton

    Cockcroft / Walton
    Built an early linear accelerator and bombarded lithium with protons to produce alpha particles
  • Chadwick

    Discovered the nuetron
  • Schrodinger

    Identified the eletron cloud model as the probable location of moving electrons.
  • Lise Meitner, Hahn, Strassman

    Lise Meitner, Hahn, Strassman
    Conducted experiments verifying that heavy elements capture neutrons and form unstable products which undergo fission. This process ejects more neutrons continuing the fission chain reaction.