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  • Nucleus (atomic structure) definition of Nucleus (atomic structure) in ...

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Nucleus (atomic structure)

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Nucleus (atomic structure), in atomic structure, the positively charged central mass of an atom about which the orbital electrons revolve. The nucleus is composed of nucleons, that is, protons and neutrons, and it accounts for nearly all the mass of the atom. See Elementary Particles.

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"Nucleus (atomic structure)," Microsoft® Encarta® Online Encyclopedia 2008
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