a) The spin-only magnetic moment (μeff) of an octahedral Mn(III) complex is 4.90 BM. Draw its d-electron configuration. Show all calculations.
b) The complex ion [Ni(CN)4]2- is diamagnetic, whereas [NiCl4]2- is paramagnetic. Use the magnetic behavior of these complexes to determine the geometric structure of each ion. Illustrate your answer with suitable diagrams.
c) For the Cr(I) ion, determine the ground state term symbol. Show how the ground state term symbol would split in octahedral symmetry. List the transitions expected for [Cr(en)2(CN)2]1-.