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jan 18, 1932 - Discovery of Neutron: Rutherford predicted in 1920 that a second particle must be in the nucleus of an atom, as if the nucleus was entirely positive the protons would push each other apart. James Chadwick, in 1932, discovered that particle, the neutron, and found its mass.

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Date:

jan 18, 1932
Now
~ 86 years ago
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