What is/are the coordination number(s) of Au in the complexes formed by Au?

What is the common oxidation state of Cu, Ag and Au?

Calculate the oxidation number of cobalt in the complex, [Co(NH_(3))_(2)(NO_(2))Cl][Au(CN)_(2)] .

What is the action of aquaragia on:- Au

Pt Au are noble metals when Pt dissolved in aquaregia forms a complex ion what is the oxidation state of Pt in that complex ion. +6 +2 +5 +4

What is 1 A.U.?