1. What’s coming up??? Nov 17 Periodic properties Ch. 10
Oct 25 The atmosphere, part 1 Ch. 8
Oct 27 Midterm … No lecture
Oct 29 The atmosphere, part 2 Ch. 8
Nov 1 Light, blackbodies, Bohr Ch. 9
Nov 3,5 Postulates of QM, p-in-a-box Ch. 9
Nov 8,10 Hydrogen and multi – e atoms Ch. 9
Nov 12 Multi-electron atoms Ch.9,10
Nov 15 Periodic properties Ch. 10
Nov 17 Periodic properties Ch. 10
Nov 19,22 Valence-bond; Lewis structures Ch. 11
Nov 24 Hybrid orbitals; VSEPR Ch. 11, 12
Nov 26 VSEPR Ch. 12
Nov 29 MO theory Ch. 12
Dec 1 MO theory Ch. 12
Dec 2 Review for exam

2. We use the radial probability distributions, as well as the concepts of
screening and penetration to understand the periodic properties of
the elements.

3. E4s < E3d In a multi-electron atom
Zeff(s) > Zeff(p) > Zeff(d)
ENERGY LEVELS REVERSE!!
E4s < E3d
S-orbital penetrates closer to nucleus

4. Closer proximity to nucleus
 Higher effective nuclear charge, Zeff

6. Increasing n
Shielding by inner shells
Increasing Zeff
Similar shielding

7. Atomic volume … density

10. The Values of First Ionization Energy for the Elements in the First Six Periods

11. Trends in Ionization Energies for the Representative Elements

12. Radii and ionization energies
both show trends due to shielding
and Zeff effects

14. The Electronic Affinity Values for Atoms Among the First 20 Elements that Form Stable, Isolated X- Ions
Rough trend is increasing exothermicity across the table

15. Names for Groups in the Periodic Table