At room temperature and pressure RbI crystallizes with theNaCl-type structure. (a) Use ionic radii to predict the length ofthe cubic unit cell edge. (b) Use this value to estimate the density.(c) At high pressure the structure transforms to one witha CsCl-type structure. (c) Use ionic radii to predict the length of the cubic unit cell edge for the high-pressure form of RbI.(d) Use this value to estimate the density. How does this densitycompare with the density you calculated in part (b)?

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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.