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nucleon
(redirected from Bag model)

   Also found in: Medical, Wikipedia, Hutchinson 0.02 sec.
nucleon, term applying to both the proton proton, elementary particle having a single positive electrical charge and constituting the nucleus of the ordinary hydrogen atom. The positive charge of the nucleus of any atom is due to its protons.
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 and the neutron neutron, uncharged elementary particle of slightly greater mass than the proton . It was discovered by James Chadwick in 1932. The stable isotopes of all elements except hydrogen and helium contain a number of neutrons equal to or greater than the number of protons.
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, 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 atom [Gr.,=uncuttable (indivisible)], basic unit of matter ; more properly, the smallest unit of a chemical element having the properties of that element.

Structure of the Atom


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; elementary particles elementary particles, the most basic physical constituents of the universe.

Basic Constituents of Matter



Molecules are built up from the atom , which is the basic unit of any chemical element .
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