2-1 Polar Covalent Bonds: Electronegativity Chemical bonds lonic bonds Bond in sodium chloride is ionic -Sodium transfers an electron to chlorine to give Na+and Cl- lons held together by electrostatic attractions between unlike charges Nonpolar Covalent bonds Two electrons are shared equally by the two bonding atoms Carbon-carbon bond in ethane Symmetrical electron distribution in the bond Most bonds are neither fully ionic or covalentChemical bonds ▪ Ionic bonds ▪ Bond in sodium chloride is ionic ▪ Sodium transfers an electron to chlorine to give Na+ and Cl- ▪ Ions held together by electrostatic attractions between unlike charges ▪ Nonpolar Covalent bonds ▪ Two electrons are shared equally by the two bonding atoms ▪ Carbon-carbon bond in ethane ▪ Symmetrical electron distribution in the bond Most bonds are neither fully ionic or covalent 2-1 Polar Covalent Bonds: Electronegativity