In Group 16 silicon dioxide is actually 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 While using the tetrahedra associated with variety a polymeric chain. Illustrations are tridymite and cristobalite. https://arthurwwusq.wikievia.com/10980429/helping_the_others_realize_the_advantages_of_titanium_nitride