For the following complexes, assign both their effective atomic numbers (valence electron counts) and the formal metal oxidation state: (i) [Co(NH3)6]³+, (ii) [Re(CH3)(1²-C2H4)(CO)2(PMe3)2], (iii) [Mn(CO)5]¯, (iv) [Ti(15-C5H5)2Br2], (v) [Ni(½³-C3H5)(µ—Cl)]2.

Platinum(II) forms many complexes, among them those with the following ligands. Give the formula and charge of each complex. (a) two ammonia molecules and one oxalate ion (C2O42-) (b) two ammonia molecules, one thiocyanate ion (SCN-), and one bromide ion (c) one ethylenediamine molecule and two nitrite ions

Give the number of unpaired electrons in octahedral complexes with strong-field ligands for (a) Rh3+ (b) Mn3+ (c) Ag+ (d) Pt4+ (e) Au3+