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. Many crystalline kinds exist Along with the tetrahedra linked to kind a polymeric chain. Examples are tridymite and cristobalite. https://johnnyywspc.digitollblog.com/38741686/not-known-details-about-3d-utskrifter-metall