CoCl3
The chemical formula for cobalt(III) bromide is CoBr3
Co(CN)2 See the wikipedia article.
The chemical formula of cobalt(III) nitrate is Co(NO3)3.
The chemical formula silicon chloride is SiCl4.
Stannus chloride, or Tin(II) Chloride's formula is SnCl2.
The formula of cesium chloride is CsCl.
The chemical formula for magnesium chloride is MgCl2.
[Ar]3d6
Aluminum III chloride is not a valid chemical formula.
The correct formula for aluminum chloride is AlCl3.
The empirical formula of sodium chloride is NaCl.
The chemical formula for lead(IV) chloride is PbCl4.