joseph john thompson the electron
DESCRIPTION
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.TRANSCRIPT
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.
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.
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.
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.
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.
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.
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.
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.
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.