answer with step by step/explanation

3. Determine the oxidation state of the transition metal ion, write the electron configuration for the metal ion, and determine if the ion is paramagnetic or diamagnetic (assume low-spin complex). a) Ca[lrF6] b) [Cu(en)2(H2O)2][SO4] (en = ethylenediamine) c) K4[Fe(CN)6] d) [Ni(DETA)2][NO3]2 (DETA = diethyltriamine )