1 jan 1932 ano - 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 )
Descrição:
https://sites.google.com/site/historyofanatom/james-chadwick
Adicionado na linha do tempo:
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Atomic theory timeline
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