We have to explain why atomic orbital contributions to the shown molecular orbital differ in size.
We will need the electron configuration of Br and I atoms to determine their valence orbitals so that we can explain the difference in size.
Bromine and iodine belong to group 7A of the periodic table.
The iodine bromide molecule, IBr, is an interhalogen compound. Assume that the molecular orbitals of IBr are analogous to the homonuclear diatomic molecule F2.
One of the valence MOs of IBr is sketched below.
Why are the atomic orbital contributions to this MO different in size?
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