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A short history of his life:
J.J. Thomson (Joseph John Thomson) was born in Cheetham Hill (a suburb of Manchester) on December 18, 1856. He is not still alive today. He went to Owens College in Manchester, in 1870. In 1876, he entered Trinity College in Cambridge as a minor scholar. Thomson studied mathematics and physics. He remained a member of Trinity College for the rest of his life and became a Lecturer in 1883 and a Master in 1918. In 1890, he married Rose Elisabeth and they had one son, (now Sir George Paget Thomson) and one daughter. J.J. Thomson died on August 30, 1940.

Early interests in atoms:

It was evident Thomson was interested in atomic structure, which was evident in his book Treatise on the Motion of Vortex Rings which he won the Adams Prize for in 1884. Joseph returned to America in 1904 and delivered six lectures about electricity and matter at Yale University. He later discovered a method used to separate different kinds of atoms and molecules from the use of positive rays. This idea was developed by Aston, Dempster, and a few other people. Thomson was elected Fellow of the Royal Society in 1884. He served as President from 1916-1920. Also, he received the Royal Medal and Hughes Medal in 1894 and 1902 and many other medals. Thomson studied in Great Britain and also in America.

Discoveries:
J.J. Thomson discovered electrons and noticed that an atom can be divided. Also, he concluded atoms are made of positive cores and negatively charged particles within it. He developed the Plum Pudding Model before the atomic nucleus was discovered. This model shows that the electrons are surrounded by a "pudding" of positive charges to balance the negative charges. Today, J.J. Thomson's discoveries have helped people to have a better understanding of the atom and its generic makeup.





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Sources!!!

MLA style: "J.J. Thomson - Biography". Nobelprize.org. 19 Nov 2010 http://nobelprize.org/nobel_prizes/physics/laureates/1906/thomson-bio.html

"J.j. Thomson Atomic Model | Tutorvista.com." Tutorvista.com - Online Tutoring, Homework Help for Math, Science, English from Best Online Tutor. Web. 22 Nov. 2010. <http://www.tutorvista.com/chemistry/jj-thomson-atomic-model>.

IMAGES:
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http://reich-chemistry.wikispaces.com/file/view/plum.jpg/147037063/plum.jpg