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It depends on the difference in electronegativity between the two atoms.

If the EN difference between two atoms is less than 0.5,the bond is nonpolar covalent.

If the EN difference between the two atoms is between 0.5 and 1.6, the bond is polar covalent.

If the EN difference between the atoms is greater than 2.0, the bond is ionic.

If the EN difference is between 1.6 and 2.0, and if a metal is involved, then the bond is considered ionic. If only nonmetals are involved, the bond is considered polar covalent.

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Electronegativity?

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