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--- 183_notes:discovery_of_the_nucleus [2015/10/14 02:04] – [Plum Pudding Model of the Atom] caballero
+++ 183_notes:discovery_of_the_nucleus [2021/05/06 20:22] (current) – [Plum Pudding Model of the Atom] stumptyl
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+Section 10.7 and 10.8 in Matter and Interactions (4th edition)
 ===== Discovery of the Nucleus =====
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 ==== Plum Pudding Model of the Atom ====
-{{ 183_notes:plum-pudding-model.jpg?200}}
+[{{ 183_notes:week8_nuceluspudding.png?300|Thomson's "Plum Pudding" Model of the Nuclues}}]
 Prior to this experiment, the leading theory of what made up atoms is credited to [[http://en.wikipedia.org/wiki/J._J._Thomson|J.J. Thomson]]. Previous experiments [[http://en.wikipedia.org/wiki/Electron#Discovery|discovered the existence and some of the properties of the electron]], but we unable to resolve details of the atom itself. Thomson suggested that matter was like a [[http://en.wikipedia.org/wiki/Christmas_pudding|plum pudding]] where the negative electron "raisins" were suspended in a pudding-like positively charged, low density "pudding".
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 ==== The Rutherford Experiment ====
-Rutherford and his team were aided in their work by the recent discovery by [[http://en.wikipedia.org/wiki/Henri_Becquerel|Henri Becquerel]], [[http://en.wikipedia.org/wiki/Marie_Curie|Marie Curie]], and [[http://en.wikipedia.org/wiki/Pierre_Curie|Pierre Curie]]. They had found that a particular radioactive source ejected high speed positively charged particles, which they called "alpha particles." These particles are what we know to be Helium nuclei now.
+Rutherford and his team were aided in their work by the recent discovery by [[http://en.wikipedia.org/wiki/Henri_Becquerel|Henri Becquerel]], [[http://en.wikipedia.org/wiki/Marie_Curie|Marie Curie]], and [[http://en.wikipedia.org/wiki/Pierre_Curie|Pierre Curie]]. They had found that a particular radioactive source ejected high speed positively charged particles, which they called "alpha particles." These particles are what [[https://en.wikipedia.org/wiki/Alpha_particle|we know to be Helium nuclei now]].
 Using a source of these particles, Rutherford and his team collimated the source to send the alpha particles at a thin gold foil target. They set up detectors to measure the deflections of the alpha particles. Most of the alpha particles they sent through the gold foil passed through with little deflection (as they had expected). However, a few of them returned back at them. That is, some of the alpha particles "bounced" off something in the gold foil and came straight back!