Using the radius ratio, predict the type of hole where the Tl+ ion is present in the TlCl crystal lattice. The ionic radius of Tl+ is 1.64 Å and the ionic radius of Cl- is 1.67 Å. a.trigonal b.cubic c.tetrahedral d.octahedral   2. The zincblende structure of ZnS is shown below: The edge length of this cubic unit cell is 540.9 pm. Determine the density of zincblende. The atomic masses of Zn and S are 65.38 amu and 32.065 amu, respectively. a.4.091 g cm-3 b.3.081 g cm-3 c.1.023 g cm-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.