History of the Atom By: Caitlyn Surdel. Ernest Rutherford.

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Presentation transcript:

History of the Atom By: Caitlyn Surdel

Ernest Rutherford

Year and Place of Discovery In year 1911 Ernest Rutherford studied radiations emitted from uranium and thorium and named them alpha and beta. Also discovered atomic model, also called nuclear atom or planetary model of the atom. Discovered in Manchester.

Facts In 1899, Rutherford had discovered alpha and beta "rays" from uranium. Now, today we know they are not rays, they are particles. 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 by undergraduate Ernest Marsden under the direction of Rutherford and German physicist Hans Geiger in 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 Most alpha particles were observed to pass straight through the gold foil, which implied that atoms are composed of large amounts of open space. Some alpha particles were deflected slightly, suggesting interactions with other positively charged particles within the atom. Still other alpha particles were scattered at large angles, while a very few even bounced back toward the source. (Rutherford famously said later, “It was almost as incredible as if you fired a 15-inch shell at a piece of tissue paper and it came back and hit you.”)

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Facts about Rutherford Born-August 30, 1871, Brightwater, New Zealand Died- October 19, 1937, Cambridge, United Kingdom Spouse- Mary Georgina Newton Parents- James Rutherford, Martha Thompson

Cites particles-atom.html particles-atom.html