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If it were on a test I'd imagine the electronegativity values would be given to each element listed because between 1.5 to 2 the molecule tends to have some covalent character, and to figure out that precise value some number would be given to us I'd imagine. So I wouldn't worry about it too much but have a general sense of what molecules are covalent and ionic bonds. Ionic bonds are usually salts like KCl, KF, LiF and covalent bonds are molecules such as Hi, HBr, HCl.
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