Give the ground state electron configuration for Mg2+?

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Give the ground state electron configuration for Mg2+.


If you could explain the answer that would help because I'm not sure I understand.

Thanks in advance!
Best Answer
Magnesium is 1s2, 2s2 2p6, 3s2. When magnesium ionizes, and loses two electrons, they come from the sublevel that is highest in energy, the 3s sublevel.

Therefore, Mg2+ is 1s2, 2s2 2p6.
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