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Neutrons were not invented, they are naturally occurring objects. They were predicted because once the Proton had been discovered it was known that atomic nuclei were almost twice as heavy as could be accounted for by the number of Protons they contained. The neutron was actually discovered in 1932 by James Chadwick when he bombard boron with alpha particles and analyzed the interaction of the neutral particles with nitrogen.

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Q: Which scientist and by which discovery invented neutrons?
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