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 (vi) If the complex ion is a cation, the metal is named same as the
element For example, Co in a complex cation is called cobalt and
Pt is called platinum