(a) The density of diamond is 3.5 g/cm3, and that ofgraphite is 2.3 g/cm3. Based on the structure of buckminsterfullerene,what would you expect its density to berelative to these other forms of carbon? (b) X-ray diffractionstudies of buckminsterfullerene show that it has aface-centered cubic lattice of C60 molecules. The length ofan edge of the unit cell is 14.2 Å. Calculate the density ofbuckminsterfullerene.

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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.