Which of the following electron configuration represents the electron configuration for a magnesium cation ... Mg^2+?

1s^2 2s^2 2p^4

1s^2 2s^2 2p^6

1s^2 2s^2 2p^6 3s^2 3p^2

None of these

Magnesium (Mg) has 12 electrons with a neutral configuration of 1s² 2s² 2p⁶ 3s².

Mg²⁺ loses 2 electrons from the outermost 3s² orbital, leaving 1s² 2s² 2p⁶.