We're being asked to determine the coordination number of iodide in the given compounds.
The coordination number is the number of ions that immediately surround an ion of the opposite charge within a crystal lattice.
Crystalline solids represent structures with well-organized patterns and shapes. When examining the particles within a crystal you may observe them tightly packed in an organized pattern. The smallest portion of which is termed the unit cell.
Let’s analyze the problem using the information we have
The structures of CsCl, NaCl, and ZnS. Each structure type can be generated by the combination of a two-atom motif and the appropriate lattice.
CuI, CsI, and NaI each adopt a different type of structure. The three different structures are those shown in the following figure.
Write the coordination numbers of iodide in CuI, CsI, and NaI, respectively.
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