1 Jan 1932 Jahr - 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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6 Okt 2017

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Atomic theory timeline

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