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

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

3. Continuum from Covalent to Ionic Bonding: Bond Character

4. Bond Order: # of bonds between two atoms

5. Bond Length

6. Bond Energy: Energy to separate two bonded atoms

7. 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

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

9. Resonance and Bond Order

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

13. Formal Charge and Oxidation Number Examples

14. Partial Charge

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

16. # Structural Pairs determines Electron Pair Geometry

17. # Structural Pairs determines Electron Pair Geometry

18. # Structural Pairs determines Electron Pair Geometry

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

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

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

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