15. Network polymer structure is. O A. Branching. O B. Liner. OC. Cross-link. 16. Strong bonding in organic chemistry is. O A. Covalent bonding. B. Hydrogen bonding. OC. Van der Waals. h 17. are cured into permanent shape is Cannot be re- melted. OA. Thermoplastics OB. Thermosetting Plastics

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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.