The answer is Cd(ClO4)2 The charge of cadmium(II) is 2+, and the charge of ClO4 is 1-. So to even the charges we must have two of the ClO4.
The chemical formula of copper(II) perchlorate is Cu(ClO4)2.
If it's copper (I): CuClO4 If it's copper (II): Cu(ClO4)2
The formula for mercury(II) perchlorate is Hg(ClO4)2. This compound is formed from the cation mercury(II) and the anion perchlorate.
Pb+4 Cl-1
The chemical formula for gold (II) oxide is Au2O.
The chemical formula of copper(II) perchlorate is Cu(ClO4)2.
If it's copper (I): CuClO4 If it's copper (II): Cu(ClO4)2
cobalt II perchlorate is an ionic compond cobalt II has an oxidation number of +2; its symbol is Co perchlorate is a polyatomic ion with a charge of -1; its formula is ClO4 therefore the formula is Co(ClO4)2
The formula for mercury(II) perchlorate is Hg(ClO4)2. This compound is formed from the cation mercury(II) and the anion perchlorate.
Formula = Pb(ClO4)2
Pb+4 Cl-1
Sn(CLO3)2 Tin (II) has a positive 2 charge and Chlorate has a (-1) charge so you need to cholrates to one Tin.
Fe(ClO4)2 is Ferrous pechlorate or Iron(II) pechlorate, however it is not a stable compound (auto-redox)
CO(Cl)4)2 It is Co(ClO4)2
The chemical formula for iron(II) hydride is FeH2.
The chemical formula of copper (II) carbonate is CuCO3.
The chemical formula of nickel(II) nitride is Ni3N2.