Gallium has an orthorhombic structure, with a0 0.45258 nm, b0 0.45186 nm and c0 = 0.76570 nm. The density is 5.904 g/cm3, and the atomic weigh is 69.72 g/mol. Determine: a- The number of atoms in each unit cell; b- The packing factor in the unit cell. %3D %3D %3D

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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.