J.J. ThomsonBy:

ChaseKelseyJustin

&Cody

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

http://upload.wikimedia.org/wikipedia/commons/b/b6/Jj-thomson2.jpg

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

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)

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

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.

Works Cited• "Atomic Magic: J. J. Thomson". Grolier Multimedia, Inc.. 11/21/08

http://library.thinkquest.org/15567/bio/thomson.html. • Carpi, Anthony . "Atomic Theory I". Vision learning, Inc.. 11/21/08

http://www.visionlearning.com/library/module_viewer.php?mid=50. • "Joseph John Thomson". Chemical Heritage Foundation. 11/21/08

http://www.chemheritage.org/classroom/chemach/atomic/thomson.html.

• Park, John. "The Thomson Model of the Atom". 11/21/08 http://dbhs.wvusd.k12.ca.us/webdocs/AtomicStructure/Thomson-Model-Intro.html.

•