First draw the Lewis dot structure:
Electron geometry: octahedral. Hybridization: sp3d2
Then construct the 3D geometry using VSEPR rules:
The molecular geometry of ICl5 is square pyramid with an asymmetric electron region distribution.
Therefore this molecule is polar.
Iodine pentachloride is a rare molecule, but here is one similar: Iodine Pentafluoride on Wikipedia.
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