A certain metal M crystallizes in a lattice described by a body-centered cubic (bcc) unit cell. The radius r of M atoms has been measured to be 158.pm .Calculate the lattice constant a of a crystal of M .Be sure your answer has the correct number of significant digits, and be sure it has the correct unit symbol.

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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.