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Blake Lecture 11-7-08 - • O 2 – predicts diamagnetic...

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Blake 11-7-08 Chemistry Ex 1: Which orbitals are used to form pi bonds? 1. Mutually perpendicular p orbitals 2. Mutually parallel p orbitals - ANSWER 3. Sp hybrid orbitals 4. Any hybrid orbitals SIGMA ARE TWO OVERLAPPING S ORBITALS MO Theory vs. Valence Bond? MO: mix atomic orbitals on different atoms to get bonding and antibonding orbitals 1. Energy levels are important 2. ENERGY LEVEL DIAGRAM VB: Hybridization: mix atomic orbitals on an atom to get new atomic orbitals 1. Hybrid orbitals overlap to form bonds or loan pairs in proper geometry, no study of energy levels Why Another Mind-Blowing Theory? Is the oxygen molecule paramagnetic or diamagnetic?
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Unformatted text preview: • O 2 – predicts diamagnetic • ITS ACTUALLY PARAMAGNETIC Things to Know • Overlap of two atomic orbitals on different atoms leads to two shared molecular orbitals 1. Bonding >Constructive interference >More electron density between nuclei >Lower in energy = ELECTRONS WILL GO IN THIS FIRST 2. Antibonding >Destructive interference >More electron density outside of nuclei >Higher in energy >REPULSION PULLS NUCLEI APART Parallel P orbitals overlap and bond together Orbital ordering for O, F, Ne • O 2 2s 2 2p 4 Orbital ordering for B, C, N • Sigma, sigma star, pi, sigma, pi star, sigma star...
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