The Lewis dot structure of Mg²⁺ (Magnesium ion with a +2 charge) is quite simple. Magnesium (Mg) is a metal in group 2 of the periodic table, which means it has 2 valence electrons in its neutral state. When magnesium forms a +2 ion, it loses these 2 valence electrons.
In the Lewis dot structure, we represent the valence electrons as dots around the element’s symbol. For Mg²⁺, since it has lost its 2 valence electrons, there are no dots around the symbol Mg. The +2 charge indicates that the atom has lost 2 electrons.
Here is the Lewis dot structure for Mg²⁺:
Mg²⁺
As you can see, there are no dots around the Mg symbol, representing the absence of valence electrons due to the +2 charge.