lonic bonding: Calculate the potential energy for an ion in a sodium chloride crystal (the lattice parameter a is 2.81 À) in units of electron volts and joules. Neglect the influence of the repulsive potential. From this, calculate the lattice energy of sodium chloride in units of joules per mole. Calculate also the cohesive energy in the same units.

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A: here, option d is correct

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