This question tests the ability to write formulas of coordination compounds using IUPAC norms. The key rules from the textbook are: (1) The central atom is listed first within square brackets, (2) Ligands are listed alphabetically, (3) The charge on the complex is determined by the oxidation state of the metal and the charges of ligands, (4) For anionic complexes, the metal name ends with '-ate' (zincate, palladate, nickelate, chromate, cuprate), (5) Cations are written outside the coordination sphere to balance the charge.