(a) Starting from Eq. 40-9, show that the ionic

Chapter 40, Problem 40.25

(choose chapter or problem)

(a) Starting from Eq. 40-9, show that the ionic cohesiveenergy is given by U0 = (ae2/4'7re0r0) ( l 1 /m ). DetermineU0 for (b ) Nal (r0 = 0.33 nm) and (c) MgO (r0 = 0.21 nm).Assume m = 10. (d ) I f you used m = 8 instead, how faro ff would your answers be? Assume a = 1.75.

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