Sec 1 Polarity of Bonds Molecules Chemical bonds lonic bonds Bond in sodium chloride is ionic -Sodium transfers an electron to chlorine to give Na*and CI 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 ! Sec 1 Polarity of Bonds & Molecules