Single Bond

FormationEx: NH3

N

H HH

1. Draw electron dot formulas.

N

H

H

H

2. Draw a game plan.

N.H

H .

3. Draw the Lewis Structure.

N

H

H

3. Draw the Structural

formula.

4. # of valence e-

H… 1(3) = 3N… 5(1) = 5+

8

Double Bond

Formation

Ex: C2H4

C CH

HH

H

C CH H

H

H

C CH H

H

H

C CH H

H

H

C CH H

H

H

# of valence e-

C… 2(4) = 8H… 4(1) = 4+

12

Triple Bond

Formation

C CH H

C CH H

C CH H

C CH H

# of valence e-

C… 2(4) = 8H… 2(1) = 2+

10

N.H

H .

H+

N.H

H .H +

O

H_

O H_

Some molecules have

properties that cannot

be explained by a single

Lewis structure.

There are 3 resonance structures.

CO O

O -2

CO O

O -2-2

CO O

O