1. Why do atoms stick together?
Chemical Bonding
Why do atoms stick together?
Who cares?

2. Types of Bonding Ionic Covalent Metallic Ionic Bonding:
Covalent Bonding:

4. Covalent Bonding Uses Valence Electrons

5. Also called Lewis Dot Symbols

6. Lewis Electron-Dot Structures: Describing Bonding in p-block compounds

7. Interpreting Lewis Structures

8. Drawing your own Lewis Structures

9. Wait! Why bother? Lewis Structure Resonance Number of Bonds Molecular
Reactivity
Lewis
Structure
Polarity
Physical State
and
Properties
Spectroscopy
Hydrophilicity
and phobicity

10. Back to Drawing Lewis Structures
I have an idea.
Do what I say.

11. Back to Drawing Lewis Structures

12. Examples

13. Examples

14. Examples

15. Properties of Bonds
Polarity
Bond Order
Bond Length
Bond Energy

16. Electronegativity Bond Polarity
Electronegativity: ability of a bonded atom to attract
the shared electrons towards itself
Origin: Orbital Energies
Trends:

17. Continuum from Covalent to Ionic Bonding: Bond Character

18. Bond Order: # of bonds between two atoms

19. Bond Length

20. Bond Energy: Energy to separate two bonded atoms

21. Bond Energy in Ionic Compounds: Lattice Energy
Energy to separate all the ions
NaCl(s)  Na+(g) + Cl-(g) H = Lattice E = -790 kJ/mol

22. Properties inside Molecules
Resonance
Formal Charge
Oxidation Number
Partial Charge

23. Resonance Structures:
When more than one reasonable Lewis Structure is possible

25. Formal Charge and Oxidation Number Examples

26. Partial Charge

27. Lewis # Structural Electron Molecular
Structure Pairs Geometry Geometry
# Structural Pairs = # bonded # lone on central atom
atoms pairs

28. # Structural Pairs determines Electron Pair Geometry

29. # Structural Pairs determines Electron Pair Geometry

30. # Structural Pairs determines Electron Pair Geometry

31. Molecular Geometry = Electron Pair Geometry, ignoring lone pairs
BF3 and O3

32. Molecular Geometry = Electron Pair Geometry, ignoring lone pairs

33. Molecular Geometry = Electron Pair Geometry, ignoring lone pairs

34. Molecular Geometry = Electron Pair Geometry, ignoring lone pairs