Ionic Potential is a parameter to characterize how tightly focused the charge of an ion is, or how dense that charge is. The simplest and most commonly used formuation is shown here. For the example of Ca2+, we come to a low value of ionic potential that we associate with a diffuse charge. In contrast, with N5+, the higher charge and smaller radius give a large value of ionic potential, and we envision N5+ as a tightly focused beacon of positive charge.

        Ionic potential is not a new concept . . . . .



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