Many polyhalide and interhalogen ions exhibit expanded valence shells
CHEMISTRY · Multi-part · AP · Chemistry · Compound Structure and Properties · Compound Structure and Properties
Problem
Many polyhalide and interhalogen ions exhibit expanded valence shells. The tetrafluoroiodate(V) anion, IF4−, is one such species and can be isolated in salts such as KIF4.
Answer the following questions about IF4−.
(a) Construct a valid Lewis diagram for IF4−, clearly indicating formal charges and lone pairs on all atoms.
(b) Identify the electron-pair geometry and the molecular geometry about the iodine atom.
(c) Determine the hybridization of the iodine atom that is consistent with the geometry identified in part (b).
(d) Predict whether the anion has a net dipole moment. Justify your answer by discussing symmetry elements present (or absent) in the three-dimensional arrangement of atoms.