https://padlet.com/riyapv20/6gei75jrg4fork4a Rutherford and his students (Hans Geiger and Ernest Marsden) bombarded very thin gold foil with α–particles. en-us 2020-09-24 07:01:55 UTC 2023-04-05 17:25:28 UTC hello@padlet.com riyapv20 https://padlet.com/riyapv20/6gei75jrg4fork4a/wish/774876868 Rutherford was born at Nelson , New Zealand. He was educated at University of New Zealand and conducted research work in 1895 with J . J . Thomson at the Cavendish Laboratory . In 1907 , he accepted Professorship at Manchester University in England where Chadwick was one of his students. He won Noble Prize in 1908 in the field of atomic physics.]]> 2020-09-24 07:04:47 UTC https://padlet.com/riyapv20/6gei75jrg4fork4a/wish/774876868 riyapv20 https://padlet.com/riyapv20/6gei75jrg4fork4a/wish/774887698 Rutherford scattering is a phenomenon in physics that was explained by Ernest Rutherford in 1911, which led to the development of the Rutherford model (planetary model) of the atom, and eventually to the Bohr model. It is now exploited by the materials analytical technique Rutherford backscattering.]]> 2020-09-24 07:10:15 UTC https://padlet.com/riyapv20/6gei75jrg4fork4a/wish/774887698 riyapv20 https://padlet.com/riyapv20/6gei75jrg4fork4a/wish/774891603 Rutherford beamed alpha particles( doubly charged helium ions) through gold foil and detected them as flashes of light or scintillation on a screen . When alpha particles collide on the screen , it scintillates. Gold foil was only 0.00004 cm thick, meaning a few hundreds of atoms thick.]]> 2020-09-24 07:12:20 UTC https://padlet.com/riyapv20/6gei75jrg4fork4a/wish/774891603 riyapv20 https://padlet.com/riyapv20/6gei75jrg4fork4a/wish/774895921 2020-09-24 07:14:33 UTC https://padlet.com/riyapv20/6gei75jrg4fork4a/wish/774895921 riyapv20 https://padlet.com/riyapv20/6gei75jrg4fork4a/wish/774901689  (i) most of the α– particles passed through the gold foil undeflected. (ii) a small fraction of the α–particles was deflected by small angles. 
(iii) a very few α– particles (∼1 in 20,000) bounced back, that is, were deflected by nearly 180° . ]]> 2020-09-24 07:17:40 UTC https://padlet.com/riyapv20/6gei75jrg4fork4a/wish/774901689 riyapv20 https://padlet.com/riyapv20/6gei75jrg4fork4a/wish/774908222 i] An atom has a tiny , dense, positively charged core called nucleus, in which all the mass is concentrated.
Ii] The negative particles called electrons, revolve around the nucleus in paths called orbits]]> 2020-09-24 07:21:09 UTC https://padlet.com/riyapv20/6gei75jrg4fork4a/wish/774908222 riyapv20 https://padlet.com/riyapv20/6gei75jrg4fork4a/wish/774914050  (i) The positive charge and most of the mass of the atom was densely concentrated in extremely small region. This very small portion of the atom was called nucleus by Rutherford.
 (ii) The nucleus is surrounded by electrons that move around the nucleus with a very high speed in circular paths called orbits. Thus, Rutherford’s model of atom resembles the solar system in which the nucleus plays the role of sun and the electrons that of revolving planets.
 (iii) Electrons and the nucleus are held together by electrostatic forces of attraction. ]]> 2020-09-24 07:24:20 UTC https://padlet.com/riyapv20/6gei75jrg4fork4a/wish/774914050 riyapv20 https://padlet.com/riyapv20/6gei75jrg4fork4a/wish/774920380 Rutherford’s does not obey the Maxwell theory of electrodynamics, according to it “A small charged particle moving around an oppositely charged centre continuously loses its energy”. If an electron does so, it should also continuously lose its energy and should set up spiral motion ultimately failing into the nucleus. 
 Rutherford could not explain how the moving electron could remain in its orbit, especially when it was charged particle and therefore it could accelerate due to its movement, finally moving closer to the nucleus and drop in to it. The atom would not be stable which in turn would mean that matter would not be composed of unstable atoms]]> 2020-09-24 07:27:10 UTC https://padlet.com/riyapv20/6gei75jrg4fork4a/wish/774920380