Barium ion (Ba²⁺) does not have a Lewis dot structure in the traditional sense. Here's why:

* Lewis dot structures represent valence electrons. Barium is in Group 2 of the periodic table, meaning it has 2 valence electrons.

* Ions lose or gain electrons. Barium loses its two valence electrons to form a +2 charge (Ba²⁺).

* No valence electrons to show. Since barium has lost all of its valence electrons, there are no electrons left to represent with dots in a Lewis dot structure.

Instead of a Lewis dot structure, you would simply represent the barium ion as Ba²⁺.