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Neutron 2
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1. Neutron
An elementary atomic particle that has no charge and a mass that's approximately the same as that of a proton. Neutrons are found in all atoms except the lightest isotope s of hydrogen.
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2. Neutron
An uncharged subatomic particle in the nucleus of an atom. The large (mass approximately equal to 1 atomic mass unit), electrically neutral particle that may occur in the atomic nucleus.
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