Atomic Models Through the Years 2

Atomic Models Through the Years 2

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  • What is this guy even talking about? I should have never asked.
  • Hey. What happened during your experiment?
  • I aimed a narrow beam of alpha particles at a thin sheet of gold foil. I expected a few of the alpha particles to be slightly deflected. However, some bounced back at large angles. The uniformly distributed positive charge within the gold atoms should have prevented the paths of the alpha particles from changing so drastically...
  • Ernest Rutherford (1871-1937)
  • Ha! Thomson was wrong. The plum pudding model is incorrect. Almost all of the atom's positive charge and almost all of its mass were contained in a small dense region in the center of the atom. I'm going to call this the nucleus. The negatively charged electrons are held within the atom because of their attraction to the positive nucleus. 
  • The nucleus contains positively charged particles called protons, which carry a charge equal to but opposite that of an electron; they have a charge of 1+.
  • Niels Bohr (1885-1962)
  • I just published a theory of atomic structures relating the electron arrangement in atoms and atomic chemical properties. I'm so smart!
  • James Chadwick (1891-1974)
  • Hey, I heard you got a Nobel Prize in Physics. What did you get it for?
  • Oh, well, I actually got it for showing that the nucleus of an atom contained another subatomic neutral particle called the neutron.  It has a mass equal to that of a proton, but doesn't carry an electric charge. 
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