Chemistry / Chem 0975 · Atom · ~20 seconds
Bond Polarity from Electronegativity Difference
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State
A bond's polarity grows as the electronegativity difference between its two bonded atoms grows, from nonpolar through polar to ionic.
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The C–H bond, a small electronegativity difference, is treated as nonpolar; the H–F bond, a large difference, is strongly polar.
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Polarity is a continuum set by electronegativity difference, not a fixed line separating "covalent" bonds from "ionic" ones.