This document discusses chemical bonding. It defines chemical bonding as the union between two atoms or groups of atoms based on valence electrons. There are three main types of chemical bonds: ionic bonds, covalent bonds, and metallic bonds. Ionic bonds involve the transfer of electrons between atoms. Covalent bonds are formed by the sharing of valence electrons between atoms. Metallic bonds are strong bonds between atoms of metals that form a sea of delocalized electrons. The document provides examples of how to determine the electron configuration, valence electrons, Lewis structure, and type of bond for different elements and compounds.