J.J. Thomson discovered the electron through a study of cathode ray.  He stated electrons had a mass about 1000 times smaller than a hydrogen atom.  His plum pudding atomic model consisted of electrons suspended in a positively charged electric field and that atoms were mostly "empty" space.  He also determined charge to mass ration as being: e/m=1.759 x 10^8 coloumbs/g in an electron.

Links to J.J Thomson: http://www.nobel.se/physics/laureates/1906/thomson-bio.html      Biography http://dbhs.wvusd.k12.ca.us/Atomic/Structure/Disc-pf-Electron-Intro.html      Diagrams and Misc. Information http://plato.standford.edu/entries/physics-experiement/app/.html      Standford Biography

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