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Chapter+11-template-1 - Chapter 11: Theories of covalent...

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Chapter 11: Theories of covalent bonding VSEPR theory : accounts for molecular shape, but Does not explain how the shape arise from atomic Orbitals. knowing shapes : can’t explain the magnetic and spectral properties of molecules. Only the understanding of their orbitals and energy levels can.
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Chapter 11: Theories of covalent bonding What is a covalent bond? What characteristic gives it strength? How can we explain molecular shapes bases on the interactions of atomic orbitals? The most useful approach: for answering these questions is based on quantum mechanics and is called valence bond theory.
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Valence Bond (VB) theory and orbital hybridization Valence Bond (VB) theory : A covalent bond forms when orbitals or two atoms overlap, and the region, which is between the nuclei, is occupied by a pair of electrons In terminology of quantum mechanics : overlap of the 2 orbitals means their wave functions are in phase (constructive interference), so the amplitude between the nuclei increases. (Figure 7.5 page 265). The central theme of VB theory derives from this principle
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theory 1 . The electrons in a shared pair have opposite spin. Orbital overlap and spin pairing in H2
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Chapter+11-template-1 - Chapter 11: Theories of covalent...

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