3. Which one of the following exhibits dipole-dipole attraction between molecules? a. BCI3 b. CO2 C. ASH3 d. XeF4 4. What fraction of the volume of each corner atom is actually within the volume of a face-centered cubic unit cell? а. 1/16 С. 1/4 b. 1/8 d. 1

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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.