Lewis Structures, Formal Charge, and Resonance
1. Draw Lewis structures for the following atoms showing all resonance structures.
Use formal charges to determine which is the most appropriate arrangement of
atoms or bonds.
a. N2O
Hoe"
O
b. S02
•'O-s-o
O - S —O:
0.^
c. CO
/Oe'
2. Draw Lewis structures for the following and assign formal charges as
appropriate. Put formal charges in a different color ink.
a. NO+
b. 022-
«'
..
c. H2C2O4
a
name:
-o - C - C - o - H
C
d.
*expanded octet
..o-l-oI
:0:
•+2,
Ir~
' &'
i'
o = I -i?
3. Fill in the missing lone pairs. Assign formal charges to ALL atoms in this Lewis
structure (use a different color ink.) Suggest a better resonance structure for this
molecule.
event (f
M
4. Place the species below in order of shortest to longest nitrogen-oxygen bond.
(Hint: Use bond order to determine this. Consider the best resonance structure
and other possible contributing resonance structures and how they might affect
the N-O bond order.)
H2NOH
6
N2O
n
O
M-0--H
0;
= /
It 0
r
1,0
NO+
-i
NO2