Rubidium iodide crystallizes with the same structure as sodium chloride. (a) How many iodide ions are there per unit cell?(b) How many rubidium ions are there per unit cell? (c) Use the ionic radii and molar masses of Rb+ 11.66 Å, 85.47 g>mol2 andI- 12.06 Å, 126.90 g >mol2 to estimate the density of rubidium iodide in g>cm3.

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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.