A study of parameter values for III, IV, V and VI spectra in the iron group is presented. The configuration 3d n , 3d n-1 4s and 3d n-1 4p in the elements Cr, Mn, Fe, Co, Ni and Cu are studied in the single configuration approximation. Fitted values of the Slater-Condon parameters F 2(3d, 3d), F 4(3d, 3d) and ζ 3d are compared with Hartree-Fock values. Values of the effective parameters α, β and T for the 3d n configurations are calculated from Hartree-Fock wavefunctions for bound states. The calculated values of α and |β| are much larger than the fitted ones which is in agreement with the situation for the 4f 2 configuration in Pr IV where other workers have shown that it is necessary to include not only excitations to bound states but also to the continuum. In some cases the effective parameters are difficult to determine precisely and these cases are discussed. Special attention is given to the T parameter in d 2 and d 8. Algebraic expressions are given for the contributions from T to α and β in these configurations.