more than the sum of the ionic radius of sodium and chloride ion radius. So we could only say r plus plus minus rr gives you nothing. And right away you notice that I am a big assumption that I am here. I am the modeling of the ions as hard spheres. I am modeling them as balls of a finite dimension. And so they finally reach this equilibrium position. And we saw that on the last day we have a Coulomb force of attraction that you have seen before. Plus one cation, anion ...
http://www.youtube.com/watch?v=IM5UZCtNKsc&hl=en
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