By. Lucia Artigas, Erick Sebastián, Yael Sánchez, Brenda Santos & Ana Paula Soltero.

Outline• Who was Thomson?• His Personal Life• The Theory• How came to be? • Mass and charge of the electron• Chemestry & Food• The Atromic Model• References

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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 in his Treatise on the Motion of Vortex Rings which won him the Adams Prize in 1884

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His Personal Life

• 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.

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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.

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How came to be?• 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.

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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.

• Thomson discovered electron by the cathode ray tube. A electric current is passed through a vacuum tube, a steam of glowing material was formed.

• 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.

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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 charged sphere.

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The Atromic Model. • These negatively charged electron

and positively charged proton make an atom neutral. For Thomson’s atomic theory model he was awarded noble prize in 1906.

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• J.J. Thomson died on August 30, 1940

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References

• MLA style: "J.J. Thomson - Biography". Nobelprize.org. 7 Nov 2012 http://www.nobelprize.org/nobel_prizes/physics/laureates/1906/thomson-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/thomson-bio.html

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