Relate edge length and atomic radius for a body-centered cubic unit cell. Metallic tantalum crystallizes in a body-centered cubic lattice, with one Ta atom per lattice point. How many atoms are there per unit cell? If the edge length of the unit cell is found to be 330 pm, what is the metallic radius of Ta in pm? 142.89 atoms pm

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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.