What would be the most likely charge of the ion formed by Mg if its Lewis dot structure is Mg? 2- 2+ 3- 3+

The most likely charge of the ion formed by Mg is 2+.

Mg has 2 valence electrons in its outer shell. In order to achieve a stable octet, it is easier for Mg to lose these 2 electrons rather than gain 6 more electrons. Therefore, Mg is more likely to lose these electrons and form a 2+ cation.