Transcript J.J Thomson

J.J Thomson
Stephanie Darnell
Born- 1856
Died- 1940
"J.J. Thomson (1856-1940)." J.J.
Thomson (1856-1940). American
Institute of Physics. Web. 3 Dec.
Electron Discovery
J.J Thomson discovered the electron in 1897
through a series of experiments involving a
cathode ray tube.
"Joseph John Thomson | Chemical Heritage Foundation."
Joseph John Thomson | Chemical Heritage Foundation.
Chemical Heritage Foundation. Web. 3 Dec. 2014.
Cathode-negatively charged conductor
Anode-positively charged conductor
Howard, Damien. "J.J. Thomson's Cathode Ray Tube (CRT):
Definition, Experiment & Diagram." Web. 3 Dec. 2014.
Plum Pudding Model
Thomson originally believed that a hydrogen atom
contained more than 2,000 electrons because
electrons are more than 2,000 times lighter than a
hydrogen atom.
An atom made of thousands of electrons would
have a very high negative charge, but atoms are
usually uncharged.
In 1906 Thomson suggested that atoms contained
far fewer electrons. He suggested that the number
of electrons was roughly close to the atomic
The electrons had to have been balanced by a
positive charge. Since this distribution was
unknown he proposed the Plum Pudding Model in
1904. This was later disproven by Rutherford.
"Cambridge Physics - Discovery of the Nucleus."
Cambridge Physics - Discovery of the Nucleus.
Cambridge Physics. Web. 3 Dec. 2014.
Nobel Prize
J.J Thomson was awarded the Nobel prize for physics in 1906 in
recognition for his great merits of his theoretical and
experimental contributions to atomic theory.
"The Nobel Prize in Physics 1906". Nobel Media AB 2014. Web. 3 Dec 2014.