Chemistry / Chem 0208 · Atom · ~20 seconds
Neutron
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A neutron is an uncharged subatomic particle in the nucleus, close in mass to a proton, confirmed by Chadwick in 1932.
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Two atoms of the same element can carry different numbers of neutrons, changing their mass without changing their chemical behavior.
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An uncharged particle does not mean a massless one; neutrons contribute to an atom's mass fully as much as protons do.