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Magnesium has an atomic number = 12. The ground state electron configuration of the magnesium ion, Mg2+, is
A) 1s2 2s2 2p6 3s2 3p2
B) 1s2 2s2 2p6 3s2
C) 1s2 2s2 2p4 3s2
D) 1s2 2s2 2p6
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