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Chem. 1 AP 11-14-04 #8 Ernest Rutherford and his Atomic Model In 1911 Rutherford do his sterling(prenominal) contribution to science with his nuclear theory of the corpuscle. His model describes the constituent as a tiny, enceinte, positively charged core called a nucleus, in which nearly all the mass is concentrated, around which the contain away, negative constituents, called electrons circulate at some distance untold like planets revolving around the Sun. The nucleus was postulated as small and dense to neb for the scattering of of import parts from thin worm up, as observe in a series of experiments performed to a lower place Rutherfords direction in 1910-11. The diagram shows a alter plan of his gold foil experiment. A radioactive spring capable of emitting alpha particles (i.e ., positively charged particles more than 7,000 clock as massive as electrons) was enclosed within a protective place shield. The light beam was focused into a narrow beam after passing game through and through a slit in a lead screen.

A thin section of gold foil was dictated in front of the slit, and a screen coated with atomic public figure 30 sulfide to render it fluorescent served as a recurrence to detect alpha particles. As each alpha particle struck the fluorescent screen, it would produce a break off of light called a scintillation, which was visible through a screening microscope abandoned to the back of the screen. The screen itself was movable, allowing Rutherford and h is associates to determine whether or not e ! very(prenominal) alpha particles were being deflected by the gold foil.Most alpha particles were observed to pass straight through the gold foil, which implied that atoms ar quiet of large amounts of open space. Some alpha particles were deflected slightly, suggesting interactions with separate positively charged particles within the atom. Still other alpha particles were illogical at large angles, while a very some even bounced back toward the...If you want to get a safe essay, order it on our website: OrderEssay.net

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