For a bond to be polar, the electronegativity difference between the two elements needs to be between 0.5 to 1.6. If the electronegativity difference is less than 0.5, the bond is nonpolar. Any more than 1.6 and the molecules become charged ions and form ionic bonds instead.
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For a bond to be polar, the electronegativity difference between the two elements needs to be between 0.5 to 1.6. If the electronegativity difference is less than 0.5, the bond is nonpolar. Any more than 1.6 and the molecules become charged ions and form ionic bonds instead.