The given statement is false. In the ZnS (zinc blend) structure, each ion does not have a coordination number of 4. In the ZnS structure, which is a type of cubic crystal lattice, each zinc (Zn) ion is coordinated by four sulfur (S) ions, forming a tetrahedral arrangement around the zinc ion. Similarly, each sulfur ion is coordinated by four zinc ions. This gives rise to a coordination number of 4 for both the zinc and sulfur ions in the ZnS structure. Therefore, the correct statement is that the coordination number of each ion (both Zn and S) in the ZnS structure is 4.