1. Electron Configuration

2. Valence Electron This atom has 8 valence e-
e- on the outermost orbit/energy level/ring
This atom has
8 valence e-

3. Rules for Electron Configuration
Hund
Everyone get e- before 1 gets 2
Aufbau
e- added to lowest Energy Level 1st a time
Pauli
Max of 2 e-, spin opposite directions

4. Energy Levels This atom has three energy levels
Most of the time = row number Known as: Orbit or the Ring Quantum Number = n
This atom has
three energy levels

5. Sub-level Blocks: s, p ,d, f Area or “Block” of the periodic table
Represents electron cloud shape
Quantum Number = l
Blocks: s, p ,d, f

6. 1
Start 2 3 4 5 6 7

7. Each Sub-level (Block) tells us the shape of the electron cloud:
Energy
max # of e- present
# shapes
Shapes s
Least 2 1 p 6 3 d 10 5
clover leaf f
Most 14 7
Too complex

10. D orbital shapes

11. F orbital shapes

12. Electron Configuration
Level block #electrons
H= 1s1

13. Element
# e-
e- config
# E level
# valence e- H He Li Be

16. Element
# e-
e- config
# E level
# valence e- B C N O F Ne

18. 1
Start 2 3 4 5 6 7

19. Element
# e-
e- config
# E level
# valence e- Ca V Ni Ge Se