How would you expect the extent of overlap of atomic orbitals to vary in the series #"IF"#, #"ICI"#, #"IBr"#, and #"I"_2#?
Well, for these interhalogens, you would expect that the order of overlap between atomic orbitals DECREASES down the group........
A priori, we would expect BETTER overlap, and stronger bonding, when the heteroatom is smaller (caution, the
And thus, in terms of bonding interaction:
And how could we assess this? Well, one way could be the interhalogen bond strength.........And I would consult your inorganic chemistry text for actual values.