Numerical Hartree-Fock (NHF) calculations have been performed for the singly charged cations Li+-Cs+ and anions H--I- in their ground states. For the cations, the NHF values in the literature are found to be insufficiently accurate, while for the anions our NHF study covers the whole series H--I- (except Sc- and Pd-) for the first time. Atomic ionization potentials and electron affinities are computed and compared with experiment.