Consider IOF$3$ and KrOF$4$ molecules. Draw the Lewis structures and employing the VSERP

theory

a$)$ predict the geometry, explain position of the O atom and relative O$-$I$-$F angles in the IOF$3$

molecule;

a$)$ predict the geometry, explain position of the O atom and relative O$-$Kr$-$F angles in the KrOF$4$

molecule.