What is the polarity of Hydrogen Iodide?

Answer 1

Unlike the other 3 binary acids comprised of one hydrogen atom and one halogen atom (HF, HCl, and HBr), the bond between hydrogen and iodine would be nonpolar, based on their electronegativity values on the Pauling Scale. Since nonpolar covalent bonds exist when the difference in electronegativity is below 0.5, the H---I bond ought to be considered nonpolar, since the difference is only 0.4.

Answer 2

Hydrogen iodide (HI) is a polar molecule. This is because iodine is more electronegative than hydrogen, resulting in an uneven distribution of electrons and a partial negative charge on the iodine atom and a partial positive charge on the hydrogen atom.