Calcium crystallizes in a body-centered cubic structure at467 °C. (a) How many Ca atoms are contained in each unitcell? (b) How many nearest neighbors does each Ca atompossess? (c) Estimate the length of the unit cell edge, a, fromthe atomic radius of calcium (1.97 Å). (d) Estimate the densityof Ca metal at this temperature.

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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.