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sep 4, 1932 - In 1932, James Chadwick discovered chargeless neutrons. This explained the mysterious mass that atoms had, that could not be created by just electrons and protons, and that did not interfere with the charge of the atom.

Added to timeline:

1 Oct 2017
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102
Developement of Ideas About the Atom

Date:

sep 4, 1932
Now
~ 86 years ago
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