8.1: Ionic and Covalent Bonding - Chemistry LibreTexts
https://chem.libretexts.org/Courses/Widener_University/Widener_University%3A_Chem_135/08%3A_Chemical_Bonding_and_Molecular_Geometry/8.01%3A_Ionic_and_Covalent_Bonding
WEBWhen the difference is very small or zero, the bond is covalent and nonpolar. When it is large, the bond is polar covalent or ionic. The absolute values of the electronegativity differences between the atoms in the bonds H–H, H–Cl, and Na–Cl are 0 (nonpolar), 0.9 (polar covalent), and 2.1 (ionic), respectively.
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