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Because the difference in their electronegativities is only about .76, the bond has mostly covalent character. Only bonds with a difference in electronegativity of 2 or greater are said to have mostly ionic character.
Ionic bonds form when the electro negativity difference between the bonding elements is roughly 1.8 or higher. Less than a 1.8 difference results in the creation of either a non-polar or a polar covalent bond. Thus, HBr does not form an ionic bond as their electronegativity difference is not greater than 1.8.
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