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.

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
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Vortex Rings which won him
Outline the Adams Prize in 1884

4. Click
His Personal Life Here
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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.
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Outline

6. Click
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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.
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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
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• 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
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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
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References Here
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Outline