In group 16 silicon dioxide is usually a quite common compound that broadly occurs as sand or quartz. SiO2 is tetrahedral with Just about every silicon atom surrounded by four oxygen atoms. Various crystalline kinds exist Using the tetrahedra associated with kind a polymeric chain. Examples are tridymite and cristobalite. https://emilianovgpyh.wikissl.com/1955267/an_unbiased_view_of_3d_utskrifter_metall