How many valence electrons are in #ICl_5#?
Both iodine, and chlorine are halogens, and therefore each such atom has 7 electrons. In the Lewis structure, therefore, we have to distribute
The geometry around iodine is square pyramidal. The electron pairs arrange themselves in an octahedral array, one of which is an iodine centred lone pair. And thus the symmetry descends from octahedral to square pyramidal.