List configurations for ground and lowest excited states
of C, N, and O. Make an educated guess about the term symbols of the possible
excited states.
Consider excitation of C to an n=3 level. Order by energy
and label by term symbol the various excited states that arise.
Expand the Slater determinant for the ground state of the Li atom. Assume the 2s spin is a . From this expression give a detailed expression for <H> in terms of the hydrogenic energies, and the relevant Coulomb and exchange integrals.