Exercise 4 For an NaCl ion pair, attractive and repulsive energies E, and ER, respectively, depend on the distance between the ions r, according to: 1.436x104 EA = ER 7.32x10-6 r8 a) Determine the bonding energy U, in term of the equilibrium interionic spacing To. b) The equilibrium interionic spacing r. -0.282 nm and the Madelung constant 1.75, calculate U..

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