Aluminum metal crystallizes in a face-centered cubic unit cell. a. How many aluminum atoms are in a unit cell? b. What is the coordination number of each aluminum atom? c. Estimate the length of the unit cell edge, a, from the atomic radius of aluminum (1.43 Å). d. Calculate the density of aluminum metal.

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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.