1. To Do 7th Lon-Capa assignment due Friday, April 8th by 10 pm.
Quiz #5 on Wednesday, April 13 in Discussion.
Continue reading Chapter 8 and doing the suggested homework.

2. Elements/Ions Do Not “Want” To Lose Electrons!

3. Electron Affinity

4. Elements/Ions Do Not “Want” To Lose Electrons!

7. A Covalent Bond

8. Clicker Question
Imagine the bond formed in the carbon monoxide molecule (C-O). Which atom would you expect to have a greater attraction for the electrons in the bond?
a) carbon
b) oxygen
c) They have the same attraction (both have n=2 as highest energy level with an electron).
d) I do not know.

9. Electronegativity

11. Bond Types

12. Bond Types

13. A Polar Bond

14. Clicker Question
Rank the following bonds from least polar to most polar:
Si-Cl P-Cl Mg-Cl S-Cl
A) S-Cl, P-Cl, Mg-Cl, Si-Cl
B) P-Cl, S-Cl, Si-Cl, Mg-Cl
C) Mg-Cl, Si-Cl, P-Cl, S-Cl
D) Mg-Cl, S-Cl, P-Cl, Si-Cl
E) S-Cl, P-Cl, Si-Cl, Mg-Cl

15. From the Periodic Table…
Electron configurations
Charges for ions in compounds (and thus formulas for compounds)
Trends
Atomic radius
Ionization energy
Electronegativity
Polarity of Bonds

16. Former Clicker Question
The following chemical reaction releases heat: A2 + B2  2AB. This means:
more stable higher average bond energies
a) Reactants Reactants
b) Reactants Products
c) Products Products
d) Products Reactants
e) I do not know.

19. Lewis Structures
Determine the total number of valence electrons in the molecule.
Form at least one bond between atoms in the molecule (a pair of electrons is a bond)
Arrange the rest of the electrons (in pairs) to satisfy the octet rule or duet rule (for hydrogen).
Watch for exceptions.