c) Calculate the theoretical density of the Zno. Hint: calculate the volume of unit cell from consideration of your sketch in Part a) and calculate the mass of the unit cell from the numbers of atoms the unit cell "owns". Compare your result with a reliable published description (state the citation source). [6] Data: Element Atomic Mass (g/mol) Atomic Radius (pm) lonic Radius (pm) 74 (Zn2) 140 (0) Zinc (Zn) 65.38 133 Oxygen (O) Avagadro's Number: NA = 6.022 x 1023 mol1 16.00 74

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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.