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Feb 9, 2010
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atom'ic num'ber




the number of positive charges or protons in the nucleus of an atom of a given element, and therefore also the number of electrons normally surrounding the nucleus. Abbr.: at. no.; Symbol: Z Also called proton number.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

atomic mass unitatomic pile
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