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jan 3, 1897 - Joseph Thompson discoveres the electron

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With the Cathode Ray Tube experiment, he discovered that in the Atom there was a negative charge. He knew that opposite charges repel, so he put a magnet against the ray. With the positive side of the magnet, the ray got attracted, with the negative side of the magnet, the ray repeled.

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ByDiego
21 Sep 2017
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Date:

jan 3, 1897
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~ 128 years ago

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