Iodine's atomic number is 53, which means it has 53 electrons. To determine the number of valence electrons, we subtract the atomic number of the element from the group number. Iodine is in group 7A, so it has 7 valence electrons.

In IF3, iodine forms bonds with three fluorine atoms. Each fluorine atom contributes one electron to the covalent bond, resulting in a total of three electrons shared between iodine and the three fluorine atoms. This leaves iodine with 7 valence electrons that are not involved in bonding. These 7 electrons surround the central iodine atom.