The+J.J.+Thomson+Hall

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= = =** Welcome to the JJ Thomson Hall.. ..where science meets the atom**=

**A little history:**
 * Joseph John Thomson was born in Manchester, England on December 18, 1856 and died on August 30, 1940. He was 83 years old. He got his education from Trinity College and became professor of Cavendish Labratory at Cambridge University in 1884. He won the Nobel Prize in 1906**

Thomson began his research in 1897. He studied at Trinity College. He discovered there were electrons in atoms.**
 * His Research:


 * Main points of his Theory:**
 * 1) There are “bodies much smaller than atoms”. Large value for charge to mass ratio.
 * 2) An atom is a sphere of positive matter where electrons are placed by electrical forces.
 * 3) The atom resembles a kind of “Plum Pudding” with the electrons being the raisins of the pudding/atom

1. Thomson’s model was not correct; the electrons were not just in a spherical cloud of positive matter.
 * Errors: **

The Experiment and His Findings: **
 * 
 * JJ Thomson discovered and named the electron. He took a skinny glass beaker that had a negative electrode on one end and a positive electrode on the other. In the middle he placed a paddle wheel.**



**During this time in the World:**


 * ** 1896- Plessy vs. Ferguson Supreme Court Case **
 * ** McKinnley becomes president **
 * ** US annexes Hawaii and the Islands **

@http://library.thinkquest.org/15567/bio/thomson.html@http://chemmaster.co.in/showchapter.php?id=2&id2=14&title=Structure%20of%20Atom @http://www.towson.edu/heartfield/events/1890.html[] [|http://www.chemheritage.org/classroom/chemach/atomic/thomson.html http://www.kutl.kyushu-u.ac.jp/seminar/MicroWorld1_E/Part2_E/P24_E/Thomson_model_E.htm][]
 * __References:__**