Unit 4: Atoms & the Periodic Table

The Quantum-Mechanical Model

1. Planck & the Photoelectric Effect
   •energy & light, electromagnetic spectrum
   •photoelectric effect
   •Planck's equation, quanta in bursts
   •Einstein's explanation (light = dual wave-particle nature)
2. Bohr's model of the atom
   •line spectrum of hydrogen
   •quantized energy levels
   •Bohr atom
3. Schrödinger's wave-mechanical model
   •electrons as waves
   •orbitals
4. Electron configurations
   •quantum #'s
   •electron configurations
   •octet rule
5. Electron configurations,day 2
   •practice

   The Periodic Table

6. Periodic Table
   •Mendeleev's table
   •families
   •chemical properties and electron configuration by group
7. Atomic radius & radii of ions v. atoms
   •definition & trends in atomic radii
   •trends in positive and negative ionic radii
8. First ionization energy
   •definition & trends in FIE
9. Practice & review
10. Exam: Atoms and the Periodic Table