Posted by Abby on Wednesday, May 16, 2012 at 9:26pm.
12Mg is 1s2 2s2 2p6 3s2 loses the two 4s electrons so the n = 2 shell has 8.
7N is 1s2 2s2 2p3 gains 3 electrons to fill the 2p shell and make n = 2 with 8 electrons
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