oct 18 - Mon, 18 Oct 10 Announcements Lecture 8 Bonding in...

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1 Mon, 18 Oct 10 • Announcements • Lecture 8 – Bonding in homonuclear diatomic molecules (14.3) – Combining the localized electron and MO models (14.5) – Orbitals: Human Inventions (14.6) Homonuclear Diatomics in Period 2 ( σ 2s ) 2
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2 • What about Be 2 ? Homonuclear Diatomics in Period 2 Be 2s Be 2s σ 2s * σ 2s Be 2 Bond order = Diatomic beryllium is not observed. Be exists as an extended solid, with many atoms bonded together in a fashion termed metallic bonding . Li(s) is also an extended solid that exhibits metallic bonding. Homonuclear Diatomics in Period 2 What if p-orbitals are involved in bonding? Consider B 2 …each B atom comes in with full 2s AOs and one electron in a 2p AO.
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3 2s 2p Our Educated Guess for the B 2 Orbital Energies Bond order = ½(4 – 2) = 1 Does this energy diagram accurately describe the MO populations in B 2 ? …apply a magnetic field to a sample of B 2 and see how it responds.
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4 Paramagnetism and Diamagnetism Substances with unpaired
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oct 18 - Mon, 18 Oct 10 Announcements Lecture 8 Bonding in...

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