Outline for Today Monday, Oct. 29 Chapter 6: Electronic Structure - - PowerPoint PPT Presentation

Outline for Today

Monday, Oct. 29

• Chapter 6: Electronic Structure of Atoms
• Many Electron Atoms
• Electron Configurations of atoms, ions, ground states,

and excited states

• Electrifying a pickle!

Warm Up Questions

• I’m thinking of an orbital that has ml=0 and it has 4 total

nodes, 2 of which are radial. What are the quantum numbers? What is the orbital’s name?

• What is angular momentum quantum number, l, for a d
• rbital?
• What is the lowest possible principal quantum number, n,

for a d orbital?

Hydrogen’s Electron Orbitals

All orbitals with the same angular momentum quantum number have the same energy

Orbital Energies for Many-Electron Atoms

An orbital’s energy increases with increasing value

• f l

Electron Spin: Either “Up”

• r “Down”

Up Down

ms=+1/2 ms=-1/2

Stern-Gerlach Experiment: Observation of electron spin

Ag

Redox Reaction with Cheap Cigar Smoke: 2 Ag (s) + 1/8 S8 (g) —> Ag2S (s)

Up Down

Example: Electron Configurations of atoms and ions

• 1. H
• 2. He
• 3. Li
• 4. Li+
• 5. Be-
• 6. C

Example: Se

Se

[Ar] 4s2 3d10 4p4 Se:

Pb

[Xe] 6s2 4f14 5d10 6p2 Pb:

Challenge Questions!

• What is the electron configuration of Ag+?
• How many unpaired electrons does Ag+ have?
• Can an electron in Ag+ be in a 5p orbital?