A common feature in high-temperature ceramic superconductors is copper (II) oxide (CuO) sheet that serves as a superconducting plane. Calculate the coulombic force of attraction between a Cu²+ and a 0². What is the repulsive force? Ionic radii of Cu²+ and O2 are 0.072 nm and 0.132 nm respectively.

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A:

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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.