In Group 16 silicon dioxide can be a quite common compound that commonly takes place as sand or quartz. SiO2 is tetrahedral with each silicon atom surrounded by 4 oxygen atoms. Numerous crystalline forms exist Along with the tetrahedra associated with sort a polymeric chain. Examples are tridymite and cristobalite. https://kylerrsrpm.blogdomago.com/37496034/top-boron-carbide-powder-secrets