1 ene 1932 año - Chadwick
Descripción:
 Chadwick discovered the neutron which is located in the nucleus. This was a major part in modelling the atom and the different parts. He also believed that there was empty space with a dense nucleus and that there was negitive and postive parts. 
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fecha:
1 ene 1932 año
Ahora mismo
 ~ 93 years ago