A list of species having the formula XZ₄ is given below: XeF₄, SF₄, SiF₄, BF₄, BrF₄, [Cu(NH₃)₄]²⁺, [FeCl₄]²⁻, [CoCl₄]²⁻, and [PtCl₄]²⁻. Defining shape on the basis of the location of X and Z atoms, the total number of species having a square planar shape is: