Final answer:
The molecular geometry for the iodine trichloride ion, ICl₃ −, is trigonal bipyramidal with an I-I-I angle of 180°.
Step-by-step explanation:
The molecular geometry for the iodine trichloride ion, ICl₃ −, is trigonal bipyramidal.
It can be described as a trigonal bipyramid with three equatorial vertices missing.
The ion has an I-I-I angle of 180°, which is expected for a linear molecular geometry.