Molecular Hamiltonian operators; classical Hamiltonian; Hamiltonian in the laboratory and internal coordinate systems. Born Oppenheimer approximation. Potential energy surfaces. Jahn Teller and Renner Teller effects. Diabatic corrections. Hartree-Fock and Hartree-Fock-Roothaan methods. Electronic correlations. Configuration interaction and coupled cluster methods. MC-SCF and UHF methods. Density matrices. Density Functional Theory. Moller-Plesset perturbation theory. Valence Bond and Spin-Coupled methods. Covalent structures and the Perfect-Pairing approximation; hybrid orbitals. Ionic configurations and polarized orbitals. Quantum Monte Carlo methods. Classical Monte Carlo and Molecular Dynamics simulations fro equilibrium and reactive systems. Theory of chemical reactivity. Lectures on literature research topics.