## Lec 21. Bigger Atoms, Hund's Rules and the Aufbau Principle

#### Lec 21. Quantum Principles -- Bigger Atoms, Hund's Rules and the Aufbau Principle -- Instructor: A.J. Shaka, Ph.D Recorded on February 27, 2014. Index of Topics: 1:22 Closed Shell Atoms 5:12 The Energy of an Atom 7:20 One and Two-Electron Integrals 8:47 Fock's Contribution 13:40 Optimized Orbitals Are Online 14:57 Who Was Roothaan? 18:48 Optimized Orbitals Are Online 22:17 The Most Stable Atom 24:45 Hund's Rules 29:22 The Basis of Rule #1 32:31 The Basis of Rule #2 33:54 The Basis of Rule #3 36:08 Predicting Stability 37:31 Practice Problem 27 39:02 The Aufbau Principle 43:29 The Periodic Table 45:20 A Cautionary Note 48:17 "Fission!" 50:09 Chemical Bonds

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