J J Thomson Stephanie Darnell Born 1856 Died

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. 2014. <http: //www. aip. org/history/elect ron/jjthomson. htm>.

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. Web. 3 Dec. 2014. <http: //www. chemheritage. org/discover/onlineresources/chemistry-in-history/themes/atomic-and-nuclearstructure/thomson. aspx>. 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. <http: //education-portal. com/academy/lesson/jj-thomsonscathode-ray-tube-crt-definition-experiment-diagram. html>.

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 number. 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. <http: //wwwoutreach. phy. cam. ac. uk/camphy/nucleus/nucle us 1_1. htm>.

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". Nobelprize. org. Nobel Media AB 2014. Web. 3 Dec 2014. <http: //www. nobelprize. org/nobel_prizes/physics/laureates/1906/>