Experimental vs theoretical value

Question 1

Experimental vs theoretical
MgF2 and MgI2

Answer 1

if there is a small difference between experimental and theoretical indicates it is 100% ionic character BETWEEN MGf2
if there is a large difference between experimental and theoretical indicates there is more covalent character than mgF2.
iodine ions are more polarising as they have larger radii
fluorine is less polarising
values for MgF2 are more negative / more exothermic than for MgI2 as the (ionic) bonding is stronger in MgF2 (because the F −ion is smaller than the I −ion)

If the the cation has smaller can polarise the anion
If the anion is larger it’s more likely to get polarised

Question 2

polarising involves covalent character as they share electrons

Answer 2

Smaller anions (like 𝐹 − ) have tightly held-electrons and are harder to polarize. Larger anions (like 𝐼 − ) have loosely held electrons that are easier to polarize. Since 𝐼 − is much bigger than 𝐹 − it gets polarized more easily.

magnesium is what polarises iodine easier to polarise as it its less electronegative easier to distort