History of the Electron

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

In his research he learned that the cathode tube in a partial vacuum conditions (almost vacuum) is given a higher voltage will issue a "beam" rays which Thomson calls this a "cathode rays" due to the light beam from the cathode (negative electrode). The cathode rays when brought near by the negative electric field will dibelokan (cathode ray beam is fabricated by the negative field), based on this, the Thomson stated that the cathode rays are particles that are negatively charged he called "corpuscle".

He also believes that the corpuscle is derived from the metal atoms are used as electrodes in the cathode tube. By using these types of different metals as electrodes which he used in the cathode tube experiments Thomson still produce the same cathode ray beam. Thomson eventually concluded that every atom is composed of definite corpuscle. Found by Thomson corpuscle is then referred to as "electron" by G. Johnstone Stoney. Of the assumptions he finally believes that the atom is not actually shaped Boys (sphere-shaped solid) but composed of atoms components.

In natural atom is in a stable condition and has a neutral charge, thereby Thomson further assume that within the atom itself there are definitely parts that are positively charged. Of the assumptions are then Thomson propose the structure of atoms as spheres with a positive-charged electron clouds are distributed randomly in it. Thomson's atomic model is known as the "plum pudding model" or in Indonesian known as a "model of raisin bread". To make it easier to imagine the atomic model then you have to imagine a bread in the shape of a sphere in which there are raisins are evenly spread randomly.