Thomson+and+Millikan

**J.J. Thomson**
J.J. Thomson discovered the electron in 1879 by using cathode rays in vacuum and they bent, which showed a negative charge. Thomson proposed that there were negatively charged particles in atoms, which he called corpuscles (now known as electrons). Thomson used his discovery to come up with a model for the atom, which became known as the plum pudding model. The plum pudding model propsed that electrons were distributed throughout the atom and the electrons were balanced by a positive "pudding" that the electrons were all in. There was no nucleus in Thomson's model of the atom.



Robert Millikan
==== Robert Millikan discovered the charge of a single electron by using an oil-drop experiment, which measured the charge on a drop of oil between two electrodes. He found the charge an electron to be 1.592× 10−19 coulomb, which is lower than the present value, but he still proved the existance of subatomic particles to skeptics.

http://www.wired.com/images/article/full/2008/04/jj_thompson_400px.jpg http://en.wikipedia.org/wiki/Image:Plum_pudding_atom.svg http://osulibrary.oregonstate.edu/specialcollections/coll/pauling/bond/pictures/portrait-millikan.jpg http://en.wikipedia.org/wiki/J._J._Thomson http://en.wikipedia.org/wiki/Robert_Millikan