The atomic number of an element is determined by the number of:

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    nuclei.
    atoms.
    neutrons.
    protons.
    neutrons and protons in its nucleus.
asked May 27, 2013 in Anatomy & Physiology by anonymous
    

1 Answer

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protons.
answered May 28, 2013 by NewSky ~Expert~ (2,450 points)

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