Atomic radii, bond angles, and the valence electrons of the atoms or ions
constituting compounds govern the bonding, structure, reactions, and physical properties
of the compounds. It is desirable that the chemical properties of known and new
compounds can be explained and predicted using universal parameters characteristic of
the constituent elements. Inorganic chemistry has developed along with the discovery of
new compounds and novel bonding modes. Therefore, it is important to understand the
bonding modes, the geometrical and electronic factors governing the bonding, and to
learn the basic concepts of molecular orbital theory.