| The Columbia Encyclopedia, Sixth Edition. 2001-07. |
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| nucleon |
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| term applying to both the proton and the neutron, the two constituents of atomic nuclei. The nucleon may be considered a single particle, of which the proton and the neutron are two different states. See atom; elementary particles. |
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| | | The Columbia Encyclopedia, Sixth Edition. Copyright © 2007 Columbia University Press. |
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