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jan 1, 1932 - JAMES CHADWICK His neutrons have no electrical charge His neutrons have a mass nearly equal to the mass of a proton The unit of measurement for subatomic particles is the the " atomic mass unit " ( amu )

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https://sites.google.com/site/historyofanatom/james-chadwick

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att

ByJT
6 Oct 2017
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Date:

jan 1, 1932
Now
~ 94 years ago

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