Write the name of each compound. [Ag(NH₃)₂]Cl; K₂[PtCl₄]; Na[Au(CN)₂]; [Cu(NH₃)₄]SO₄

Step 1. $[\text{Ag}(\text{NH}_{3})_{2}]\text{Cl}$. The complex is the cation. Two ammine ligands, and silver is $+1$: diamminesilver(I) chloride.

Step 2. $\text{K}_{2}[\text{PtCl}_{4}]$. The complex is the anion. Four chlorido ligands give $-4$, and the complex is $-2$, so platinum is $+2$: potassium tetrachloridoplatinate(II).

Step 3. $\text{Na}[\text{Au}(\text{CN})_{2}]$. The complex is the anion with a charge of $-1$. Gold is $+1$ and takes its Latin name: sodium dicyanidoaurate(I).

Step 4. $[\text{Cu}(\text{NH}_{3})_{4}]\text{SO}_{4}$. The complex is $+2$ because sulphate is $-2$: tetraamminecopper(II) sulphate.