the ionic radii for K^+ and O^2- as 0.138 and 0.140 nm, respectively. (a) What is the coordination number for each O^2- ion? (b) Brief y describe the resulting crystal structure for K2O. (c) Explain why this is called the antif uorite structure

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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.