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What is struature of the atom as proposed by rutherford?
Rutherford atomic model, The Rutherford atomic model [Credit: Encyclop dia Britannica, Inc.]description of the structure of atoms proposed (1911) by the British physicist Ernest Rutherford. [ The model described the atom as a tiny, dense, positively charged core called a nucleus, in which nearly all the mass is concentrated, around which the light, negative constituents, called electrons, circulate at some distance, much like planets revolving around the Sun. The Rutherford atomic model has been alternatively called the nuclear atom, or the planetary model of the atom. The nucleus was
postulated as small and dense to account for the scattering of alpha particles from thin gold foil, as observed in a series of experiments performed under Rutherford’s direction in 1910–11 (see The Rutherford gold-foil experiment [Credit: Encyclop dia Britannica, Inc.]Figure). The diagram shows a simplified plan of his gold foil experiment. A radioactive source capable of emitting alpha particles (i.e., positively charged particles more than 7,000 times as massive as electrons) was enclosed within a protective lead shield. The radiation was focused into a narrow beam after passing through a slit in a lead screen. A thin section of gold foil was placed in front of the slit, and a screen coated with zinc sulfide to render it fluorescent served as a counter to detect alpha particles. As each alpha particle struck the fluorescent screen, it would produce a burst of light called a scintillation, which was visible through a viewing microscope attached to the back of the screen. The screen itself was movable, allowing Rutherford and his associates to determine whether or not any alpha particles were being deflected by the gold foil. ]
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Asked 4/19/2012 6:02:52 AM
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What is activated complex?
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Updated 6/5/2015 1:27:29 AM
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An activated complex is an intermediate structure formed in the conversion of reactants to products.

Added 6/5/2015 1:27:29 AM
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