1. Today’s Do Now
Write the Lewis dot diagram for the ionic bond between sodium and sulfur.
Write the Lewis structure for the H2S molecule.
Do resonance structures exist for either of the above compounds? Explain your answer.

2. Today’s Game Plan Do Now 10 minutes INM: VSEPR 25 minutes
Practice Time!!
15 minutes
Independent Practice
30 minutes
Closing & Exit Ticket

3. This is going to get real…
VSEPR
This is going to get real…

4. By the end of the class period today I will be able to…
draw and predict the VSEPR shape of molecules

5. Valence Shell Electron Pair Repulsions (VSEPR)
a model used to predict the molecular structures of molecules

6. Valence Shell Electron Pair Repulsions (VSEPR)
MAIN IDEA: the structure around a given atom is determined by minimizing repulsions between electron pairs

7. Why VSEPR? Consider SiF4
Lewis Dot Diagram
VSEPR F Si F F F

8. Why VSEPR? VSEPR Lewis Dot Diagrams
Predicts number and types of bonds between the atoms
Indicates lone pairs of electrons
2D instead of 3D
Predicts the shapes of molecules (3D)
Provides NO information about presence of double or triple

10. VSEPR Shapes with 2 Electron Pairs on the Central Atom
Linear Shape

11. Linear Shape
Atoms Bonded to Central Atom: 2
Lone Pairs on Central Atom: 0
Pairs exist 180º from one another

12. Linear Shape: Example
SiO2

13. VSEPR Shapes with 3 Electron Pairs on the Central Atom
Trigonal Planar
Bent

14. Trigonal Planar Shape
Atoms Bonded to Central Atom: 3
Lone Pairs on Central Atom: 0
Pairs exist 120º from one another

15. Trigonal Planar: Example
BF3

16. Bent Shape
Atoms Bonded to Central Atom: 2
Lone Pairs on Central Atom: 1

17. Bent Shape: Example
SO2

18. VSEPR Shapes with 4 Electron Pairs on the Central Atom
Tetrahedral
Trigonal Pyramidal
Bent

19. Tetrahedral Shape
Atoms Bonded to Central Atom: 4
Lone Pairs on Central Atom: 0
Pairs exist 109.5º from one another

20. Tetrahedral Shape: Example
CCl4

21. Trigonal Pyramidal Shape
Atoms Bonded to Central Atom: 3
Lone Pairs on Central Atom: 1

22. Trigonal Pyramidal Shape
NH3

23. Bent Shape
Atoms Bonded to Central Atom: 2
Lone Pairs on Central Atom: 2

24. Bent Shape: Example
H2O

25. Today’s Game Plan Do Now 10 minutes INM: VSEPR 25 minutes
Practice Time!!
15 minutes
Independent Practice
30 minutes
Closing & Exit Ticket

26. Guided Practice Time!
1. Draw the Lewis Dot Diagram for the following molecules
2. Predict the VSEPR shape for the molecule
3 minutes to work on each example

27. Practice Question #1
H2S

28. Practice Question #2
CI4

29. Practice Question #3
NBr3

30. Practice Question #4
SF2

31. Today’s Game Plan Do Now 10 minutes INM: VSEPR 25 minutes
Practice Time!!
15 minutes
Independent Practice
30 minutes
Closing & Exit Ticket

32. Today’s Game Plan Do Now 10 minutes INM: VSEPR 25 minutes
Practice Time!!
15 minutes
Independent Practice
30 minutes
Closing & Exit Ticket

33. Gallery Walk
With your partner, create one of the VSEPR shapes learned today using marshmallows and toothpicks.
Rotate groups to identify with your partner the proper VSEPR shapes

34. Today’s Homework
Complete VSEPR worksheet