A compound which is prepared from gypsum has the property of hardening when mixed with proper quantity of water.(i) Identify the compound.(ii) Write the chemical equation for its preparation.(iii) Mention one important use of this compound.

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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.