Ernest Rutherford's theory of the existence of the neutron was proved by James Chadwick (1 jan 1932 ano – 31 dez 1932 ano)

Descrição:

James Chadwick was able to determine that the neutron did exist and that its mass was about 0.1 percent more than the proton's. He published his findings with characteristic modesty in a first paper entitled "Possible Existence of Neutron."

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