1. WARM UP
Write configurations for the following elements, using noble gas notation: S Co Au Cs

2. Periodic Trends

3. Effective Nuclear Charge
Amount of “hold” the nucleus exerts
Increases left to right
Decreases top to bottom

4. Atomic Radius Size of the atom Decreases left to right
Increases top to bottom

5. Ionization Energy Energy it takes to remove an electron
Increases left to right
Decreases top to bottom

6. Electron Affinity / Electronegativity
How good an atom is at pulling in an electron
Increases left to right
Decreases top to bottom (generally)

7. WRAP UP Which atom is larger? Which atom has a stronger nucleus?
Ca or Fr
Which atom has a stronger nucleus?
Al or O
Which atom has a higher electron affinity?
Na or Cl
Which atom has a higher ionization energy?

8. WARM UP
List each of the 4 properties that exhibit periodic trends, and describe the trend of each of them.

9. WRAP UP Which atom is larger? Which atom has a stronger nucleus?
Al or I
Which atom has a stronger nucleus?
B or In
Which atom has a higher electron affinity?
S or Ne
Which atom has a higher ionization energy?
Li or Ca