12 h 16 m, 25 ene 1932 año - Chadwick
Descripción:
Chadwick discovered the neutron, and how they are located in the center of the atom with the protons. Concluded that neutrons neither have a positive nor negative charge but contribute to the atomic weight with the same effect as the protons.
Añadido al timeline:
Atomic Theory Project: timeline portion
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