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Joseph John Thomson

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Joseph John Thomson, better known as JJ Thomson (1856-1940) a British physicist noted as the inventor of the electron which is part of the atom, he also received the physics Nobel Prize for his invention. Born in Creetham Hill, a suburb of Manchester on December 18, 1856. He became speaker in 1883, and became professor in 1918. He was professor of experimental physics at the Cavendish Laboratory, Cambridge, where he replaces John Strutt, 3rd Baron Rayleigh, from 1884 to 1918 and became a distinguished professor of physics at Cambridge and the Royal Institution, London.

In his research he learned that the cathode tube at partial vacuum conditions (almost vacuum) is given a high voltage will issue a "beam" which Thomson calls this light as "cathode rays" caused these rays coming from the cathode (negative electrode). Cathode-ray beam is brought closer to the electric field when it will been turned negative (cathode-ray beam was rejected by the negative field), on this basis the Thomson stated that cathode rays are charged particles are negative which he calls a "corpuscle".

He also believes that the corpuscle was originated from the metal atoms are used as electrodes in the cathode tube. By using the types of different metal as an electrode which he used in the test tube cathode Thomson still produce the same cathode-ray beam. Thomson eventually concluded that each atom must be composed of the corpuscle. Discovered by Thomson corpuscle is then referred to as "electron" by G. Johnstone Stoney. From this assumption he was finally convinced that the atom is actually not in the form K. (in the form of solid spheres), but are composed of subatomic components.

electron

Atom is in a stable condition and has a neutral charge, thereby Thomson further assume that within the atom itself would have a positively charged parts. From this assumption the Thomson proposed the atomic structure as spheres with positive-charged electron clouds are distributed randomly in it. Thomson atom model is better known as the "plum pudding model" or in the Indonesian language is known as the "raisin bread model". To make it easier to imagine this atom model then you have to imagine a ball of bread in the form in which there are raisins evenly spread randomly.