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A neutral hadron that is stable in the atomic nucleus but decays into a proton, an electron, and an antineutrino with a mean life of 12 minutes outside the nucleus. Its rest mass is slightly greater than that of the proton, being 1.674 9286(10)×10 −27 kg. Neutrons occur in all atomic nuclei except normal hydrogen. The neutron was first reported in 1932 by the British physicist James Chadwick (1891–1974).

Subjects: Chemistry.

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