7.1 Periodicity and lattices of crystal structure 7.2 Symmetry in crystal structures 7.3 X-ray diffraction of crystals 7.4 Quasi-crystal, liquid crystal and amorphous
6.1 Multi-center bonds in electron-deficient systems 6.2 Chemical bonds in coordination compounds 6.3 Ligand Field Theory (LFT) 6.4 Transition-metal cluster compounds 6.5 Carbon clusters and nanotubes