According to valence bond theory, what set of orbitals isused by a Period 4 metal ion in forming (a) a square planarcomplex; (b) a tetrahedral complex?

Definition Definition Theory that explains how individual atomic orbitals with an unpaired electron each, come close to each other and overlap to form a molecular orbital giving a covalent bond. VBT gives a quantum mechanical approach to the formation of covalent bonds with the help of wave functions using attractive and repulsive energies when two atoms are brought from infinity to their internuclear distance.