The Role of Electronegativity in Bond Polarity The critical factor that determines if a covalent bond is polar or nonpolar is electronegativity, which is the atom's ability to attract shared electrons. This unequal sharing creates a dipole, with a partial negative charge (δ-) developing on the more electronegative atom and a partial positive charge (δ+) on the other.
Understanding Equal Sharing in Nonpolar Bonds
4 Nonpolar Covalent Equal or nearly equal sharing 0. The electrons drift equally between the nuclei, maintaining a symmetrical charge distribution.
In contrast, water (H₂O) has a bent shape that prevents the cancellation of its polar O-H bond dipoles, making the entire molecule polar. The greater the difference in electronegativity, the more polar the bond becomes.
Understanding Equal Sharing in Nonpolar Bonds
The vector sum of all the individual bond dipoles must be considered. Conversely, a polar covalent bond involves a moderate difference in electronegativity, typically ranging from about 0.
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