The electronegativity is 2.1 for H and 2.5 for I.Based on these electronegativities,HI would be expected to

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Electronegativity is a measure of an atom's ability to attract electrons in a chemical bond. The difference in electronegativity between H (2.1) and I (2.5) is not large enough to form an ionic bond but is significant enough to create a polar covalent bond. Since Iodine (I) is more electronegative than Hydrogen (H), it will attract the shared electrons more strongly, resulting in a partial negative charge on the I atom and a partial positive charge on the H atom, making option D correct.

The Electronegativity Is 2