LiH crystallizes with H-ions defining either a simple cubic or a face-centered cubic lattice. The solid has a density of 0.77 g/cm3. If the edge of the unit cell is 4.086 x 10-8cm, how many Li+and H-ions are there in one unit cell? Which unit cell is appropriate for LiH?

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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.