Different levels of structure including bonding. Pauling rules and atomic radii relationship to ionic crystal structure. Binary and complex crystal structures. Crystal structures, representative crystal structures in metals and ceramics, crystallographic computations, symmetry. Amorphous materials, crystalline and semi-crystalline state of polymers. Overview of point, line and surface defects in ordered and disordered materials. Correlating structures and defects with physical, mechanical and chemical properties of engineering materials.