In the polymeric silicon dioxide:
1) each silicon atom is surrounded by fouroxygen atoms and each O atom is bonded to two silicon atoms
2) each silicon atom is surrounded by two oxygen atoms and each O atom is bondedto two silicon atom
3) silicon atom is bonded to two oxygen atoms
4) these are double bonds between silicon andoxygen atoms
1) each silicon atom is surrounded by fouroxygen atoms and each O atom is bonded to two silicon atoms