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7 / 33  Magnesium has an atomic number of 12. Which of the following statements is true of a neutral magnesium atom?
A  It has 12 protons, 12 electrons, and 12 neutrons.
B  It has 12 protons, 12 electrons, and six neutrons.
C  It has six protons, six electrons, and no neutrons.
D  It has six protons, six electrons, and six neutrons.

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Source:  OpenStax, Concepts of biology. OpenStax CNX. Feb 29, 2016 Download for free at http://cnx.org/content/col11487/1.9
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