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You just need to remember that as the difference in electronegativity increases, the ionic character increases. This usually occurs in the top right of the periodic table with F, Cl, and O being the most electronegative.
If the electronegativities are given, the calculated difference in electronegativity for the molecule can determine whether the molecule is ionic or covalent. However, if the numbers are not given, the trends for electronegativity or polarizability based on the size of the atoms and charges(if it is an ion) can be used to determine and support your answer.
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