Ernest Rutherford's theory of the existence of the neutron was proved by James Chadwick (1 ene 1932 año – 31 dic 1932 año)

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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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