Question
Which of the following is the ground-state electron configuration of the Mg2+ ion? \text { a. } 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} \text { b. }[\mathrm{Ne}] 3 s^{2} \text { c. }[\mathrm{Ne}] 3 s^{2} 3 p^{2} \text { (d) }[\mathrm{He}] 2 s^{2} 2 p^{6} \text { e. }[\mathrm{He}] 2 s^{2} 2 p^{8}
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