Joseph John Thompson The electron.

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Sir Joseph John Thomson The Nobel Prize Winning Physicist Who Discovered the Electron!

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Presentation transcript:

Joseph John Thompson The electron

Biography J.J. Thompson was born in Cheetham Hill, the suburb of Manchester, on December 18, 1865. He attended Owens College in 1870. Thompson then continued onto Trinity College minor Scholar in 1876. J.J. Thompson died August 30, 1940. He was buried near Isaac Newton and Charles Darwin.

Discovery Most of his work was done in London. Thompson discovered a method for separating different kinds of atoms and molecules by the use of positive rays. The rays that he used were isotopes of neon.

Isotopes of Neon In 1912 he channeled a stream of ionized neon through a magnetic and electrical field. Thompson used deflection techniques to measure the charge of mass ration. This led to the discovery that neon is composed of two different kinds of atoms and proved existence of isotopes in a stable manner.

Cathode Rays Also, J.J. Thompson studied cathode rays. Cathode rays are glowing beams of light that follow an electrical discharge in a high-vacuum tube. Thompson passed these rays through the vacuum. He was then able to measure the angle at which the rays were deflected and then could calculate the ratio of the electrical charge to the mass of particles.

Cathode Rays Conclusion This led him to discover the ratio was the same no matter what type of gas was used. Later, he concluded particles made up of universal gases.

Demonstration A crooks tube is a sealed glass tube from which nearly all the air has been removed and through the walls of which are passed two electrodes. We are proving cathode rays is deflected on a magnetic field.

Determined J.J. Thompson soon determined that matter is made up of particles smaller than atoms. They were originally called Corpuscles, but are now called electrons.

Plum Pudding This was proposed by J.J. Thompson in order to add the electron to the atomic model. In the model, the atom is composed of electrons surrounded by a soup of positive charge in order to balance the electrons' negative charges, like negatively charged plums surrounded by positively charged pudding. The main goal was to balance the charges of atoms.

Work Cited Dingrando, Laurel. Chemistry: Matter and Change. New York, NY: Glencoe/McGraw-Hill, 2005. Print. Infoplease. Infoplease, n.d. Web. 31 Oct. 2013. "J.J. Thomson - Biographical." J.J. Thomson - Biographical. N.p., n.d. Web. 31 Oct. 2013. "J.J. Thomson Biography." Bio.com. A&E Networks Television, n.d. Web. 31 Oct. 2013.