1. Chemical Bonding and Interactions
The Ties That Bind
Chemical Bonding and Interactions

2. Chemical Bonding and Interactions
Stable Electron Configurations
Electron-Dot (Lewis) Structures
Drawing, Rules for Drawing
The Octet Rule
Some Exceptions to the Rule
Ionic Bonding
Naming ionic compounds
Drawing
Covalent Bonding
Naming covalent compounds
Electronegativity and Polar Covalent Compounds
Molecular Shapes and the VSEPR Theory
Intermolecular Forces of Attraction
H-bonds, Dipole-Dipole, Ion-Dipole, London Dispersion Forces

3. MOLECULAR GEOMETRY

4. The VSEPR Model
Predicting Molecular Geometries

5. 0 lone pairs on central atom 2 atoms bonded to central atomCl Be
0 lone pairs on central atom
2 atoms bonded to central atom
10.1

6. 10.1

7. The VSEPR Model
Predicting Molecular Geometries

8. 10.1

9. bonding-pair vs. bonding
pair repulsion
lone-pair vs. lone pair
repulsion
lone-pair vs. bonding
>

10. The VSEPR Model
Molecules with Expanded Valence Shells

11. The VSEPR Model Molecules with Expanded Valence Shells
To minimize e--e- repulsion, lone pairs are always placed in equatorial positions.

12. The VSEPR Model
Molecules with Expanded Valence Shells

13. 10.1

14. 10.1

15. 10.1

16. The VSEPR Model

17. The VSEPR Model Molecules with More than One Central Atom
In acetic acid, CH3COOH, there are three central atoms.
We assign the geometry about each central atom separately.

18. Predicting Molecular Geometry
Draw Lewis structure for molecule.
Count number of lone pairs on the central atom and number of atoms bonded to the central atom.
Use VSEPR to predict the geometry of the molecule.
What are the molecular geometries of SO2 and SF4? S F S O
AB4E
AB2E
distorted
tetrahedron
bent
10.1

19. The VSEPR Model Predicting Molecular Geometries
To determine the electron pair geometry:
draw the Lewis structure;
count the total number of electron pairs around the central atom.
arrange the electron pairs in one of the above geometries to minimize e--e- repulsion.
multiple bounds count as one bonding pair.