Lacey_Che131_F2011_Lect-30p

Lacey_Che131_F2011_Lect-30p - Lec-30: Valence Bond Theory...

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Unformatted text preview: Lec-30: Valence Bond Theory Roy A. Lacey, Stony Brook University; Che 131, Fall 2011 1 Bonding Your Basic Chemical Bonding Tool Kit Your Basic Chemical Bonding Tool Kit Lewis Symbols Lewis Symbols The Octet Rule Lewis Structures Resonance Structures Formal Charges V alence S hell Electron P air R epulsion Your Advanced Chemical Bonding Tool Kit Your Advanced Chemical Bonding Tool Kit Valence Bond Theory (VB) (VB) Molecular Orbital Theory (MO) (MO) Roy A. Lacey, Stony Brook University; Che 131, Fall 2011 2 Valence Bond Theory 1. 1. Limitations of Lewis Structures and VSEPR Limitations of Lewis Structures and VSEPR Is based on the octet rule which has many exceptions. Gives only information about geometry. Cannot adequately explain bonding in species such as Li 2 and H 2 + . Does not reflect the QUANTUM QUANTUM nature of electrons. Roy A. Lacey, Stony Brook University; Che 131, Fall 2011 3 Valence Bond Theory 2. 2. Quantum Mechanical Theories of Bonding Quantum Mechanical Theories of Bonding Valence Bond Theory - Involves the overlap of atomic orbitals. Molecular Orbital Theory > Will be discussed in the next lecture Roy A. Lacey, Stony Brook University; Che 131, Fall 2011 4 Valence Bond Theory Bonds are formed from the overlap of orbitals Roy A. Lacey, Stony Brook University; Che 131, Fall 2011 5 of orbitals Valence Bond Theory...
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Lacey_Che131_F2011_Lect-30p - Lec-30: Valence Bond Theory...

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