joseph john thompson the electron

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The electron

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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.

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Page 1: Joseph John Thompson The electron

The electron

Page 2: Joseph John Thompson The electron

BiographyJ.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.

Page 3: Joseph John Thompson The electron

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 usedwere isotopes of neon.

Page 4: Joseph John Thompson The electron

Isotopes of NeonIn 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.

Page 5: Joseph John Thompson The electron

Cathode RaysAlso, 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.

Page 6: Joseph John Thompson The electron

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.

Page 7: Joseph John Thompson The electron

DemonstrationA 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.

Page 8: Joseph John Thompson The electron

DeterminedJ.J. Thompson soon determined that matter is

made up of particles smaller than atoms.They were originally called Corpuscles, but

are now called electrons.

Page 9: Joseph John Thompson The electron

Plum PuddingThis 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.

Page 10: Joseph John Thompson The electron

Work CitedDingrando, 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.