In network of silica (SiO2) each silicon atom is surrounded by _________ atoms of osygen

In network of silica (SiO2) each silicon atom is surrounded by _______

1.	In network of silica (SiO2) each silicon atom is surrounded by _________ atoms of osygen
A.	4
B.	2
C.	1
D.	6
Answer» B. 2