<Tr> <Td> Generalized valence bond Modern valence bond Resonance </Td> </Tr> <Tr> <Th> Molecular orbital theory </Th> </Tr> <Tr> <Td> Hartree--Fock method Semi-empirical quantum chemistry methods Møller--Plesset perturbation theory Configuration interaction Coupled cluster Multi-configurational self - consistent field Quantum chemistry composite methods Quantum Monte Carlo Linear combination of atomic orbitals </Td> </Tr> <Tr> <Th> Electronic band structure </Th> </Tr>

Electronic structure of isolated atom vs solid material