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 m l = 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 orbital? • 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 of l
Electron Spin: Either “Up” or “Down” m s =+1/2 m s =-1/2 Up Down
Stern-Gerlach Experiment: Observation of electron spin Ag Down Up Redox Reaction with Cheap Cigar Smoke: 2 Ag (s) + 1 / 8 S 8 (g) —> Ag 2 S (s)
Example: Electron Configurations of atoms and ions 1. H 2. He 3. Li 4. Li + 5. Be - 6. C
Example: Se Se
Se: [Ar] 4s 2 3d 10 4p 4
Pb 4f 14 5d 10 Pb: [Xe] 6s 2 6p 2
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?
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