1. Orbital Notation

2. 3 Rules to Follow
Rule #1:
Aufbau Principle- Electrons must enter the orbital of lowest energy first

3. Rule #2:
Pauli Exclusion Principle- no two electrons can have the same spin in the same orbital (two electrons must have opposite spins)

4. Rule #3:
Hund’s Rule- When electrons enter each orbital first until all the orbitals contain one electron before they start to double up.
(AKA: Empty Bus Seat Rule)

5. Orbital Diagrams Example: Sodium 1st: Write Electron Configuration
Example: Nitrogen
1st: Write Electron Configuration

6. Practice, Practice, Practice!!!Sn C Pd