1. By: Chase Kelsey Justin & Cody
J.J. Thomson
By:
Chase
Kelsey
Justin
&
Cody

2. Joseph John Thomson Born: December 18, 1856 Died: August 30, 1940
Recognized as the British scientist who discovered and identified the electron
Professor of physics at Trinity College
Won the 1906 Nobel Prize for Physics

3. Theory Announced his theory on April 30, 1987
Announced that Cathode Rays were negatively charged particles called Corpuscles (things from which atoms were build up)
Have a mass of about 1000 times smaller than a hydrogen atom
Theory not accepted until 1899

4. Cathode Ray Tube
Thomson founded the electron with the cathode ray tube
He found that the (-_electrons were inside (+) charges (After Eugene Goldstein found atoms had a positive charge)

5. Theory Thomson discovered the electron, the first subatomic particle
His work suggested that the Atom was not an “indivisible” particle like john Dalton had suggested

6. Theory
J.J. Thomson is also remembered for his "plum-pudding" model of the atom, which suggested a solid atom with positively and negatively charged particles evenly distributed throughout the mass of the atom.

7. Works Cited
"Atomic Magic: J. J. Thomson". Grolier Multimedia, Inc.. 11/21/08
Carpi, Anthony . "Atomic Theory I". Vision learning, Inc.. 11/21/08
"Joseph John Thomson". Chemical Heritage Foundation. 11/21/08
Park, John. "The Thomson Model of the Atom". 11/21/08