What is the correct shape of CO2?
#1: What are bonds
made of?
#2: What charge are
electrons?
What is the correct shape of CO2?
Will those (-) charges attract or repel?
(Clue: look at 2 balloons)
A) Attract
B) Repel
Question:
Key Pt 1: Bonding Groups
Single bonds = 1 bonding group
Double bonds =
Triple bonds
Example: CCl4
- Bonding Groups = 4
Question:
Key Pt 1: Bonding Groups
Single bonds = 1 bonding group
Double bonds = 1 bonding group
Triple bonds
Example: CHOF
- Bonding Groups= 3
Question:
Key Pt 1: Bonding Groups
Single bonds = 1 bonding group
Double bonds = 1 bonding group
Triple bonds 1 bonding group
Example: CHOF
- Bonding Groups= 2
Key Pt 1: Bonding Groups
Question:
Single lone pair= 1 nonbonding group
Two lone pairs=
Three lone pairs =
Example: AsH3
-Nonbonding Groups= 1
Key Pt 2: Nonbonding Groups
Question:
Single lone pair= 1 nonbonding group
Two lone pairs= 2 nonbonding group
Three lone pairs = 3 nonbonding group
Example: SHCl
-Nonbonding Groups= 2
Key Pt 2: Nonbonding Groups
Question:
Single lone pair= 1 nonbonding group
Two lone pairs= 2 nonbonding group
Three lone pairs = 3 nonbonding group
Example: SHCl
-Nonbonding Groups= 2
Key Pt 2: Nonbonding Groups
Question:
Single lone pair= 1 nonbonding group
Two lone pairs= 2 nonbonding group
Three lone pairs = 3 nonbonding group
Example: SHCl
-Nonbonding Groups= 0
 How
many bonding groups are there?
(Double Bonds = Just one bonding group)
A) 3
B) 4
C) 8
 How
many nonbonding groups are there?
(Nonbonding: Only count around central atom)
A) 0
B) 3
C) 5
32
0
 How
many nonbonding groups are there?
(Nonbonding: Only count around central atom)
A) 0
B) 3
C) 5
 Cut
and paste into your notebooks.
Question:
alence
hell
lectron
air
epulsion
spread out as much as possible.
A) Attract
B) Repel
alence
hell
lectron
air
epulsion
spread out as much as possible.
Step 1: Molecule
Count # Electron Groups
around central atom
2 bonding
groups
Step 2: Balloon
Spread out as far as
possible. Angle?
180°
Step 3: Geometry
Determine the shape.
Linear
A)Linear
B) Trigonal Planar
C)Trigonal Pyramid
D)Tetrahedral
VSEPR:Valence Shell Electron Pair Repulsion.
Electron Groups stay as far apart as possible.
Electron Groups
2
Electron Groups
Electron
Groups
2 Bonding
Groups
Shape:
Linear
Shape:
Shape:
Shape:
Shape:
alence
hell
lectron
air
epulsion
spread out as much as possible.
Step 1: Molecule
Count # Electron Groups
around central atom
3 bonding
groups
Step 2: Balloon
Spread out as far as
possible. Angle?
120°
Step 3: Geometry
Determine the shape.
Trigonal
Planar
A)Linear
B) Trigonal Plana
C)Tetrahedral
VSEPR:Valence Shell Electron Pair Repulsion.
Electron Groups stay as far apart as possible.
Electron Groups
Electron Groups
2 Bonding
Groups
3 Bonding
Groups
2
Electron
Groups
3
Shape:
Shape:
Linear
Trigonal
Planar
Shape:
Shape:
Shape:
 How
will these groups spread out?
(How many electron groups? 4 electron groups)
(Balloon demo: what happens?)
A)
B)
C) None of
the above
 What
shape is this most like?
(How many corners?
4 corners)
A) Triangular Pyramid
B) Rectangular Pyramid
 What
else is this shape called?
(Mono = 1, Di = 2, Tri = 3,
Tetra = 4, Penta = 5)
A) Trihedron
B) Quadrahedron
C) Tetrahedron
alence
hell
lectron
air
epulsion
spread out as much as possible.
Step 1: Molecule
Count # Electron Groups
around central atom
4 bonding
groups
Step 2: Balloon
Spread out as far as
possible. Angle?
109.5°
Step 3: Geometry
Determine the shape.
Tetrahedral
A)Linear
B) Trigonal Plana
C)Tetrahedral
VSEPR:Valence Shell Electron Pair Repulsion.
Electron Groups stay as far apart as possible.
Electron Groups
Electron Groups
2 Bonding
Groups
3 Bonding
Groups
2
Electron Groups
3
4
4 Bonding
Groups
Shape:
Shape:
Shape:
Linear
Trigonal
Planar
Tetrahedral
Shape:
Shape:
 What
kind of shape will form?
(Bonding groups = 3)
A) Trigonal Planar
C)Tetrahedral
B) Trigonal Pyramidal
VSEPR:Valence Shell Electron Pair Repulsion.
Electron Groups stay as far apart as possible.
Electron Groups
Electron Groups
2 Bonding
Groups
3 Bonding
Groups
2
Electron Groups
3
4
4 Bonding
Groups
Shape:
Shape:
Shape:
Linear
Trigonal
Planar
Tetrahedral
Shape:
Shape:
 What
kind of shape will form?
(Bonding groups = 3)
A) Trigonal Planar
C)Tetrahedral
B) Trigonal Pyramidal
 What
kind of shape will form?
(Bonding groups = 2)
A) Trigonal Planar
C)Tetrahedral
B) Trigonal Pyramidal
VSEPR:Valence Shell Electron Pair Repulsion.
Electron Groups stay as far apart as possible.
Electron Groups
Electron Groups
2 Bonding
Groups
3 Bonding
Groups
2
Electron Groups
3
4
4 Bonding
Groups
Shape:
Shape:
Shape:
Linear
Trigonal
Planar
Tetrahedral
Shape:
Shape:
 What
kind of shape will form?
(Bonding groups = 3)
A) Tetrahedral
C) Linear
B) Straight
alence
hell
lectron
air
epulsion
spread out as much as possible.
Step 1: Molecule
3 bonding,
Count # Electron Groups
1 nonbonding
around central atom
Step 2: Balloon
Spread out as far as
possible. Angle?
Step 3: Geometry
Determine the shape.
109.5°
109.5°
Trigonal
Pyramidal
VSEPR:Valence Shell Electron Pair Repulsion.
Electron Groups stay as far apart as possible.
Electron Groups
2
2 Bonding
Groups
Electron Groups
Electron Groups
3
3 Bonding
Groups
4
4 Bonding
Groups
Shape:
Shape:
Shape:
Linear
Trigonal
Planar
Tetrahedral
3 bonding
1 nonbonding
Shape:
Trigonal
Pyramidal
Shape:
 What
will the overall shape of SF2 be?
(Count around central atom only)
A) Linear
B) Tetrahedral
 How
many corners will SF2 have?
(1 atom = 1 corner)
A) 2 corners
B) 3 corners
C) 4 corners

Remove one more dot from candy tetrahedron.
What letter does it look like now?
V-shaped
alence
hell
lectron
air
epulsion
spread out as much as possible.
Step 1: Molecule
2 bonding,
Count # Electron Groups
2 nonbonding
around central atom
Step 2: Balloon
Spread out as far as
possible. Angle?
109.5°
Step 3: Geometry
Determine the shape.
Bent
109.5°
VSEPR:Valence Shell Electron Pair Repulsion.
Electron Groups stay as far apart as possible.
Electron Groups
2
2 Bonding
Groups
Electron Groups
Electron Groups
3
3 Bonding
Groups
4
4 Bonding
Groups
Shape:
Shape:
Shape:
Linear
Trigonal
Planar
Tetrahedral
3 bonding
2 bonding
1 nonbonding 2 nonbonding
Shape:
Trigonal
Pyramidal
Shape:
Bent
 What
is the shape of PCl3?
(# Bonding =
3
# Nonbonding = 1
A) Trigonal Planar
B) Trigonal Pyramidal
C) Tetrahedral
)
VSEPR:Valence Shell Electron Pair Repulsion.
Electron Groups stay as far apart as possible.
Electron Groups
2
2 Bonding
Groups
Electron Groups
Electron Groups
3
3 Bonding
Groups
4
4 Bonding
Groups
Shape:
Shape:
Shape:
Linear
Trigonal
Planar
Tetrahedral
3 bonding
2 bonding
1 nonbonding 2 nonbonding
Shape:
Trigonal
Pyramidal
Shape:
Bent
 What
is the shape of PCl3?
(# Bonding =
3
# Nonbonding = 1
A) Trigonal Planar
B) Trigonal Pyramidal
C) Tetrahedral
)
 What
is the shape of SCl2?
(# Bonding = 2
# Nonbonding = 2
A) Linear
B) Tetrahedral
C) Bent
)
VSEPR:Valence Shell Electron Pair Repulsion.
Electron Groups stay as far apart as possible.
Electron Groups
2
2 Bonding
Groups
Electron Groups
Electron Groups
3
3 Bonding
Groups
4
4 Bonding
Groups
Shape:
Shape:
Shape:
Linear
Trigonal
Planar
Tetrahedral
3 bonding
2 bonding
1 nonbonding 2 nonbonding
Shape:
Trigonal
Pyramidal
Shape:
Bent
 What
is the shape of PCl3?
(# Bonding = 2
# Nonbonding = 2
A) Linear
B) Tetrahedral
C) Bent
)