CuI, CsI, and NaI each adopt a different type of structure.The three different structures are those shownin Figure 12.26. (a) Use ionic radii, Cs+ 1r = 1.81 A° 2,Na+ 1r = 1.16 A° 2, Cu+ 1r = 0.74 A° 2, and, I- 1r = 2.06 A° 2, topredict which compound will crystallize with which structure.(b) What is the coordination number of iodide in eachof these structures?

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Crystal Lattices and Unit Cell

Consider a crystal. The regular and repeating pattern of constituent particles is the most distinguishing feature of crystalline solids. A crystal lattice is formed when these particles are replaced with representative points. The three-dimensional arrangement of constituent particles is known as a crystal lattice. Unit cell is that the smallest portion of a space lattice which when repeated in several directions, generate the whole lattice. Unit cell is a building block of a lattice. It is the smallest unit of cell.