Chap 1A - Atomic Electronic Configurations Aufbau principle...

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Atomic Electronic Configurations •Aufbau principle: Place electrons in lowest energy orbital first. •Pauli exclusion principle: A maximum of two electrons of opposite spin occupy an atomic orbital, which are spin paired . •Hund’s rule: Equal energy orbitals are half- filled, spins parallel , then filled. •Only valence electrons of each atom are energetically accessible for chemical bonds.
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Origin of the “Octet Rule”
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Lewis Structures - Attaining the “Octet”
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C H 4 C H H H H N H 3 N H H H O H 2 O H H ! ! ! Electron Pairs, Octet Rule, & Lewis Structures
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Covalent Bonding: Structural Generalization
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C 2 NH 7 Structures: Constitutional Isomers
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Formal Charge of bonded atom (FC) (FC) Carbon = 0 (FC) Nitrogen = 0
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Formal Charge (FC) FC = # free atom valence e 's # bonded atom valence e 's # free atom valence e 's # lp e 's + # bp e 's 2 + H 3 C O H H H 3 C O H H H 3 C O + H
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Electrostatic Potential Maps: Visualizing Formal Charges H O H H O H H H O
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Lewis Structures, 2nd Period Atom with Multiple Bonds 1. Calculate total # valence electrons
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This note was uploaded on 05/08/2010 for the course CHEM 1200 taught by Professor Mcintosh during the Spring '08 term at Rensselaer Polytechnic Institute.

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Chap 1A - Atomic Electronic Configurations Aufbau principle...

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