, are used to indicate the number of the
individual ligands in the coordination entity When the names of
the ligands include a numerical prefix, then the terms, bis, tris,
tetrakis are used, the ligand to which they refer being placed in
parentheses For example, [NiCl2(PPh3)2] is named as
dichloridobis(triphenylphosphine)nickel(II) (v) Oxidation state of the metal in cation, anion or neutral coordination
entity is indicated by Roman numeral in parenthesis