The metal potassium crystallizes in a body centered cubic unit cell. When X-rays with A-2.103 A are used, the second-order Bragg reflection from a set of parallel planes in a(n) potassium crystal is observed at an angle 0-23.25°. If the spacing between these planes corresponds to the unit cell length (da), calculate the edge length of the potassium unit 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.