Thomsons atomic theory pp.
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This document provides an outline about the life and work of J.J. Thomson, including his discovery of the electron. It notes that Thomson was a professor at Cambridge University interested in atomic structure. His experiments with cathode ray tubes led him to discover subatomic particles called electrons and propose in 1904 that atoms consist of a positively charged sphere with embedded negative electrons, making atoms electrically neutral. This became known as the "plum pudding" model of the atom.
Thomsons atomic theory pp.
- 1. By. Lucia Artigas, Erick Sebastián, Yael Sánchez, Brenda Santos & Ana Paula Soltero.
- 2. Outline • Who was Thomson? Click Here • His Personal Life Click Here • The Theory Click Here • How came to be? Click Here • Mass and charge of the electron Click Here • Chemestry & Food Click Here • The Atromic Model Click Here • References Click Here
- 3. Who Was Thomson? • Was born in Cheetham Hill • Manchester on December 18, 1856 • He was Cavendish Professor of Experimental Physics at Cambridge • Thomson's early interest in atomic structure was reflected Click in his Treatise on the Motion of Here To go to Vortex Rings which won him Outline the Adams Prize in 1884
- 4. Click His Personal Life Here To go to Outline • In 1890, he married Rose Elisabeth, daughter of Sir George E. Paget, K.C.B. They had one son, now Sir George Paget Thomson, Emeritus Professor of Physics at London University, who was awarded the Nobel Prize for Physics in 1937, and one daughter.
- 5. The Theory • An atom consists of a sphere of positive charge with negatively charged electron embedded in it. • The positive and the negative charges in an atom are equal in magnitude, due to which an atom is electrically neutral. It has no over all negative or positive charge. Click Here To go to Outline
- 6. Click Here How came to be? To go to Outline • Thomson in 1904 to deliver six lectures on electricity and matter at Yale University, suggestions as to the structure of the atom. He discovered a method for separating different kinds of atoms and molecules by the use of positive rays.
- 7. Mass and charge of the electron • In spite of the progress made from all the cathode-ray tube experiments, no one succeeded in determining the mass of a single cathode-ray particle. Unable to measure the particles mass directley, English phisicist J.J. Thomson began a sries of cathod-ray tube experiments at Cambridge University in the 1890s to determine the ratio of its charge to its mass.
- 8. • Thomson discovered electron by the cathode ray tube. A electric current is passed through a vacuum tube, a steam of glowing material was formed.
- 9. • Thomson found that the mysterious glowing stream would bend toward a positively charged electric plate. Thomson atomic theory proved that the stream is made up of small particles which is piece of the atom and is negatively charged. Thomson named these particles as electrons. Click Here To go to Outline
- 10. Chemestry & Food • Thomson’s atomic theory model was compared to a because it was seen that as the stawberries are embedded in the cake similarly the negatively charged electrons was also embedded in the positively Click Here charged sphere. To go to Outline
- 11. Click The Atromic Model. Here To go to • These negatively charged electron and Outline positively charged proton make an atom neutral. For Thomson’s atomic theory model he was awarded noble prize in 1906.
- 12. • J.J. Thomson died on August 30, 1940 Click Here To go to Outline
- 13. Click Here To go to Outline
- 14. • MLA style: "J.J. Thomson - Biography". Nobelprize.org. 7 Nov 2012 http://www.nobelprize.org/nobel_prizes/physics/laureates/1906/thoms on-bio.html • Copyright © The Nobel Foundation 1906 • TO CITE THIS PAGE: MLA style: "J.J. Thomson - Biography". Nobelprize.org. 7 Nov 2012 http://www.nobelprize.org/nobel_prizes/physics/laureates/1906/thoms on-bio.html Click References Here To go to Outline