Determine the molecular geometry of each molecule.
(c) CFCl3 (carbon is central)
(d) H2CS (carbon is central)
In SiO2 the central atom is Si, surrounded by two O atoms.
14Si Ne 3s2 3p2 8O 1s2 2s2 2p4
Total number of valence electrons = 4 + 6(2)=16
Lewis structure of SiO2=
Steric number (SN) = (number of atoms bonded to central atom) +(number of lone pair on central atom)
SN = 2 + 0= 2
SN is 2 i.e linear structure with bond angle 180o.