5. The structure shows anions (dark circles) in a simple cubic array with cations (white circles) in alternating body centers. One unit cell is shown. Complete the following table for one unit cell to determine the ratio of cations to anions. f is the fraction each atom in in the indicated position contributes to the cell. Cation alculate the LI-Br distance in the crystal structure in pm. Anion Corners # # Faces # Edges f # Body f TOTAL ION PER CELL

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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.