7. (a) If positive and negative ions attract each other, why does the structure not collapse? (5) (b) Why is it that the cohesive energy of an ionic crystal is almost equal to the attractive Coulomb energy? (5)
7. (a) If positive and negative ions attract each other, why does the structure not collapse? (5) (b) Why is it that the cohesive energy of an ionic crystal is almost equal to the attractive Coulomb energy? (5)
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Transcribed Image Text:7. (a) If positive and negative ions attract each other, why does the structure not collapse?
(5)
(b) Why is it that the cohesive energy of an ionic crystal is almost equal to the attractive
Coulomb energy?
(5)
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