Using IUPAC system, write the formula of the following compound: {Potassium trioxalatochromate (III) }

rules for writing formula
The formula of a coordination complex is written in a different order than its name. The chemical symbol of the metal center is written first. The ligands are written next, with anion ligands coming before neutral ligands. If there is more than one anion or neutral ligand, they are written in alphabetical order according to the first letter in their chemical formula.
The IUPAC name of the compound is K3[Cr(C2O4)3]