* Iodine (I2) is a diatomic molecule: It consists of two iodine atoms bonded together.

* Electronegativity: Iodine atoms have the same electronegativity. This means they pull on the shared electrons in the bond with equal force.

* No net dipole moment: Since the electrons are shared equally, there is no separation of charge or formation of a positive and negative end (a dipole moment) within the molecule.

Therefore, iodine crystals are considered nonpolar.