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It was discovered that Beryllium, when attacked by alpha particles, it gives off a very energetic stream of radiation
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Chadwick discovered a new particle and called it a neutron. He did experiments with the radiation and got a result that it had no charge or energy.
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Chadwick said this radiation as being composed of particles with a normalelectrical charge and the mass of a proton. This particle became known as the neutron.
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