200px stylised lithium atom

atomic theory

By 100035081
  • 400

    democritus

    democritus
    he theorized everything was made atoms

  • isaac newton

    isaac newton
    Proposed a mechanical universe with small solid masses in motion.

  • john Dalton

    john Dalton
    Proposed an "atomic theory" with spherical solid atoms based upon measurable properties of mass.

  • 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. Faraday himself was not a proponent of atomism.

  • J. plucker

    J. plucker
    Built one of the first gas discharge tubes ("cathode ray tube").

  • G.J. Stoney

    G.J. Stoney
    Proposed that electricity was made of discrete negative particles he called electrons ". (Link to info on electrons)

  • JJ Thompson

    JJ Thompson
    Used a CRT to experimentally determine the charge to mass ratio (e/m) of an electron =1.759 x 10 8 coulombs/gram. "plumb pudding model"

  • Earnest Rutherford

    Earnest Rutherford
    Studied radiations emitted from uranium and thorium and named them alpha and beta.Studied uranium and thorium and called their spontaneous decay process "radioactivity". atoms mostly empty