Calculate the bond strength in [eV] of a sodium ion in a crystal of NaCl. For the salt lattice:

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(a) Consider only the six nearest-neighbor Cl- ions. The Cl- ions are at a distance r = 2.76 . from the Nation. (b) In addition to the six nearest-neighbor Cl- ions, include the twelve next-nearest-neighbor Na+ ions at a distance Ver. (c) Now include the eight next-next-nearest-neighbor Cl-ions at a distance V3r. (d) Finally, include the six next Na+ ions at a distance of 2r.