CHEM 1021 Lecture Notes - Lecture 34: Barium, Abbreviation, 2 On
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D sublevel flower or figure-eight with a circle around the middle. What we know about quantum numbers so far: Principle energy level (n=1, 2, 3. : average energy of an electron. Sublevels (s, p, d, f, g, h. : s sublevel shape is a sphere, p sublevel shape is a figure-eight or dumbbell. Orbitals: volume in which electrons are found with 90% probability. Clicker question: how many orbitals are in 4dsublevel: 3, 10, 5, 7. Pauli exclusion principle: a maximum of two electrons can occupy each orbital, and they must have opposite spins, spins are designated by an up ( (cid:895) arro(cid:449) a(cid:374)d a do(cid:449)(cid:374) (cid:894) (cid:895) arro(cid:449) Example: electron configuration and orbital diagram for h and he group states. 1s(^1) this represents the number of electrons in the sublevel. Hu(cid:374)d"s rule: electrons are distributed into orbitals of identical energy (same sublevel) in such a way as to give the maximum number of unpaired electrons.
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