1. Where is the Electron Located?

2. The Quantum Model of the Atom
Heisenberg uncertainty principle: It is impossible to determine both the position and velocity of an electron or any other particle

3. What is the Address of the Electron?
Principle Quantum Number (n): Indicates the energy level occupied by an electron.
Angular Momentum (l): Indicates the shape of the orbital (s,p,d,f,g)

4. Atomic Numbers and Quantum Numbers
Magnetic Quantum Number (m): Indicates the orientation of an orbital around the nucleus.
Spin Quantum Number (↓↑): Indicates which way the electron is spinning

5. What are the Rules Governing Electron Configuration?
Aufbau Principle: An electron occupies the lowest energy orbital available
Pauli Exclusion Principle: Only two electrons per orbital and they must spin in opposite directions
Hund’s Rule: Each orbital of equal energy must have one electron before a second electron is added

6. Let’s Fill Up The Orbitals!

7. Summary of Orbitals Principle Quantum # Sublevels Number of Orbitals
Number of Electrons 1 s 2
s, p 3 8
s, p, d 5 18 4
s, p, d, f 7 32

8. Predicting the 1s Orbital

9. Exceptions to Aufbau