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    The numerical value for the calcium oxide lattice energy based on the
    Born-Haber cycle and the theoretical value based on calculation are very similar.
    However, there is an 8% difference between the values for calcium iodide, with
    the Born-Haber cycle value being more negative.

    Compare the bonding in calcium oxide with that of calcium iodide and explain
    fully why there is a significant difference between the experimental and
    theoretical lattice energy values for calcium iodide
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    Have you thought about the polarisability of the anions?
 
 
 
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Updated: March 2, 2018
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