22 h 22 m, 27 ene 1891 año - James Chadwick
Descripción:
James Chadwick played a vital role in the atomic theory, as he discovered the Neutron in atoms. Neutrons are located in the centre of an atom, in the nucleus along with the protons. They have neither a positive nor negative charge, but contribute the the atomic weight with the same effect as a proton.
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Atomic Model
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