A metal atom that has an atomic weight of 69.892 amu crystallizes in a face-centered cubic lattice (4 atoms/unit celI). If the density of the metal is 8.528 g/cm3, what is the radius of the atom in pm? Recall that 1 m 1012 pm and 1 g 6.022*1023 amu. %3!

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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.