1. VSEPR
Theory
Lesson Six

2. VSEPR
Group 1: BeF2, HgCl2, CO2
Group 2: AlCl3, SO2, O3
Group 3: CH4, OF2, PCl3
Group 4: PCl5, SBr2, XeF2
Group 5: SF6, ClF5, XeF4
In groups, observe the groups attached to the center atom, groups of lone pairs, and groups of atoms. Create a chart and be prepared to come up to the board and enter in your findings

3. Molecule. Lewis Structure. Groups Bonded. Electrons Bonded
Molecule Lewis Structure Groups Bonded Electrons Bonded to Central Atom to Central Atom
BeF2 2 F Be F
HgCl2
CO2

4. Molecule. Lewis Structure. Groups Bonded. Electrons Bonded
Molecule Lewis Structure Groups Bonded Electrons Bonded to Central Atom to Central Atom
AlCl3
SO2 O3

5. Molecule. Lewis Structure. Groups Bonded. Electrons Bonded
Molecule Lewis Structure Groups Bonded Electrons Bonded to Central Atom to Central Atom
CH4
OF2
PCl3

6. Molecule. Lewis Structure. Groups Bonded. Electrons Bonded
Molecule Lewis Structure Groups Bonded Electrons Bonded to Central Atom to Central Atom
PCl5
SBr2
XeF2

7. Molecule. Lewis Structure. Groups Bonded. Electrons Bonded
Molecule Lewis Structure Groups Bonded Electrons Bonded to Central Atom to Central Atom
SF6
ClF5
XeF4

8. VSEPR
The properties of molecules depend on the bonding atoms as well as the 3-D arrangement of atoms in space
VSEPR (Valence Shell Electron Pair Repulsion)
VSEPR theory states that repulsion between the sets of valence-level electrons surrounding an atom causes these sets to be oriented as far apart as possible

9. VSEPR
This assumption that electrons in molecules repel each other accounts for the molecular shapes of each atom
You need to learn these so that you can draw out the arrangement of atoms and fully understand their orientation
Consider a diatomic molecule such as BF2 that we discussed. What arrangement could be created so that the atoms are the farthest apart?
If the molecules are arranged on opposite sides of the central atom they are the farthest apart
Let’s go through this video to get a visual of these shapes

10. VSEPR

11. VSEPR
Now that we have a good idea of the possible shapes, let’s work through this tutorial for further practice with these three-dimensional shapes and more clearly visualize the shapes
Make sure to explore all parts of the website and take notes. These will help you be able to draw and visualize many different molecules

12. Example for five bonding domains
The molecule is in its VSEPR shape. The Lewis Structure is located to the right.
Click on the links to change the molecule to the left.
Example for five bonding domains