PS 12.1A
(pg 1 of 2)
Drawing Lewis Structures
Write the Lewis structure for the following molecular compounds.
1
Br2
6
H2S
2
SiS
7
CS2
3
CF4
8
CCl2S
4
CCl3H
9
O3
5
PCl3
10 H2SiS3
(put the Si in the center,
attach H’s to separate S’s)
PS 7.1A (pg 2 of 2)
Drawing Lewis Structures
ANSWERS
1
Br2
6. H2S
It does not matter in what position the non-bonded
electrons are placed.
14 e- Non-polar
8 e-
Br Br
Non-Polar
2 SiS
The location of the non-bonded electrons around each
atom does not matter. Non-Polar
10 e-
3
Si S
C
26 e-
F
C
S
C-Cl is P
e- pull from C towards Cl’s
Cl
Cl
Cl
Cl C
S
e- pull from C to Cl’s
The double bond is hooked to the S not the Cl because of
sulfur’s 6 valence electrons are more prone to forming 2
bonds than Cl’s 7 valence electrons.
C
H
Cl
5 PCl3
It does not matter on which side of the phosphorous
atom the non-bonded electron is placed.
P
CCl2S
C-S id NP
Cl
C-H is NP
e- pull towards Cl’s
Non-Polar
C-Cl is P
4 CCl3H
It does not matter in which position the H atom is placed.
Cl
S
CS2
24 e-
F
P-Cl is P
H
16 e-
8
F
26 e-
S
Carbon will be in the middle to avoid unshared pairs.
CF4 Polar! electrons pull towards F’s
F
7
H
Cl
9 O3
In the ozone molecule the oxygen’s must be bonded
together since there is no other option. It is not a very
stable molecule.
18 eNon-polar
O
O
O
10 H2SiS3
24 eS-H is NP
S Si
S-Si is P
e- pull from Si towards S’s
S
H
S H