Packing and Packing efficiency in Solids-Class 12 Chemistry We know that there are 7 crystal systems and 14 types of unit cells that occur in nature. The solid states of the majority of metallic elements, some covalent compounds, and many ionic compounds occur as cubic lattices. There are three types of cubic unit cells within the cubic system. Let’s pack the three cubic unit cells and the hexagonal unit cell and also determine their packing efficiency. The packing efficiency is the percentage of the total volume occupied by the spheres themselves. We already know that unit cells result from the way the atoms pack together in a crystal lattice. The simple cubic unit cell: When we arrange the first layer of spheres (imagine particles of the crystals to be identical spheres) in vertical and horizontal rows, then large diamond-shaped spaces are formed. If we place the second layer of spheres directly above the first layer, we obtain the arrangement based on the simple c
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