Discovery of the Electron

Discovery of the Electron - properties are independent of...

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Discovery of the Electron Michael Faraday , 1807 o observation: in electrolysis of compounds, there is a definite relationship between the amount of element freed and the quantity of electricity passed through the compound o hypothesis: charge is somehow involved in binding elements together to form compounds George Stoney, 1891 o hypothesis: atoms contain balanced positive and negative charges; the negative charges within atoms are "electrons" 2 J. J. Thomson 's cathode ray experiment o "catho de rays" pass from negative electrode towards positive electrode in an evacuated tube hypothesis: cathode rays are streams of electrons o calculated mass to charge ratio for electrons by observing bending of cathode rays in electric and magnetic fields o proposed the plum pudding model of the atom Table: Hypothetical properties of the electron. How J. J. Thomson used properties of cathode rays to hypothesize properties of the electron. observations hypothesis ray
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Unformatted text preview: properties are independent of the cathode material ... cathode ray component of all m cathode rays bend near magnets ... magnets bend t moving charged maybe cathode streams of movin particles rays bend towards a positively ... cathode rays are charged plate. rays impart a negative charge to objects they strike. negative charges Cathode rays don't bend around small obstacles, cast sharp shadows, can turn paddlewheels placed in their path, and travel in straight lines ... cathode rays b streams of particles • R. A. Millikan 's oil drop experiment o observation: charges on tiny droplets of liquid are always whole number multiples of a certain value o hypothesis: this value was the charge on a single electron o Nobel Prize, 1923 • electrons play a central role in chemistry o number and energies of electrons in an atom determine chemical properties of an element o electrons bind atoms into molecules...
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This note was uploaded on 11/22/2011 for the course CHEMISTRY CHM1025 taught by Professor Laurachoudry during the Fall '10 term at Broward College.

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Discovery of the Electron - properties are independent of...

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