16 marks
The table shows the theoretical and experimental (Born-Haber) lattice energy data for two metal halide compounds, sodium chloride and magnesium iodide.
| Lattice energy / kJ mol–1 | ||
| Metal halide | Theoretical | Experimental (Born-Haber) |
| Sodium chloride | −770 | −780 |
| Magnesium iodide | −1944 | −2327 |
Using the data, compare and contrast the type and strength of bonding in these compounds.
Give reasons for your answers.
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