Ionic potential is the ratio of electric charge to the radius of an ion.
As such, the proportion measures the charge density at the surface of the ion; usually the denser the charge, the stronger will be the bond that the ion forms.
The ionic potential gives the sense of how strongly or weakly the ion will be attracted, electrostatically, to ions of opposite charge; and to what extent the ion will repel other ions of like charge.
References
Ionic potential Wikipedia(Text) CC BY-SA