1. Williamsburg High School for Architecture and Design
Periodicity, Part 1
Williamsburg High School for Architecture and Design
Mr. Quinn and Ms. Tom
10/28/13

2. Aim
How is the periodic table organized?

3. The Periodic Table

4. Atomic Radius The distance from the middle of the nucleus to the outermost electron shell

5. How does atomic radius relate to group and period?
The circles indicate relative atomic radius 
As we move right across periods, radius decreases
As we move down a group, radius increases

6. Outer Shell Electrons aka Valence Electrons
The total number of electrons on the outer shell
Which sublevels does this include?

7. Outer Shell Electrons
What do you notice about the number of outer electrons in each group?
They are the same
As we move right across a period, valence electrons…
Increase
As valence electrons increase, atomic radius decreases

8. Ionization Energy
The amount of energy required to remove a valence electron

9. Ionization Energy As we move across a period, ionization energy…
Increases
As we move down a group, ionization energy…
Decreases
As number of valence electrons increases, ionization energy increases

10. Electron Affinity
The amount of energy gained by adding an electron to the outer shell

11. Electron Affinity As we move across a period, electron affinity…
Increases
As we move down a group, electron affinity…
Stays the same

12. Electron Affinity
As number of valence electrons increases, electron affinity…
Increases
As ionization energy increases, electron affinity…