1. To Do Quiz #4 next Wednesday (3/16).
6th HW assignment due Wednesday, March 16, by 10 pm.
Exam 2: Thursday, March 17, 7:00 pm

2. Wave-Particle Duality

3. Average atom (not to scale)

4. A First Attempt: WRONG!

5. A Change Between Two Discrete Energy Levels Emits a Photon of Light

6. Electromagnetic Spectrum

7. Wrong Model Gets it Right!
Water vs liquid nitrogen

8. Interference of Waves

9. Big Ideas – Waves Waves interfere with one another.
Constructive interference: adding
Destructive interference: canceling
The higher the energy, the more complex.
Waves are a measure of probability.
Not obvious.
Controversial when introduced.

10. Electrons Electrons are most likely to be found near the nucleus
Electrons could be any distance (very far even)
We do not know how the electron moves
ORBITALS = regions of 90% probability

12. The probability distribution for a hydrogen 1s orbital

13. Radial Probability Distribution (1s)

15. Representation of p orbitals

16. Representation of d orbitals

17. Representation of f orbitals

18. Orbital Energy Levels for the Hydrogen Atom

19. Quantum Numbers