oct 18 continue - 10/19/2010 Wed, 20 Oct 10 Announcements...

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10/19/2010 1 Wed, 20 Oct 10 • Announcements – Exam 1 will cover through Monday’s lecture (period 1 diatomics and the beginning of period 2 MOs) – The rest of period 2 diatomics will be covered on the final exam • Lecture 9 – Bonding in homonuclear diatomic molecules (14.3) – Combining the localized electron and MO models (14.5) – Orbitals: Human Inventions (14.6) We will not cover Bonding in heteronuclear diatomic molecules (14.4) Homonuclear Diatomics in Period 2 Consider Li 2 molecule. Each atom has 1s 2 2s 1 Only the 2s AOs participate in the bonding MO because they overlap in space. Li 2 has a bonding pattern similar to H 2 , because the atoms overlap through the 2s AOs. The 1s orbitals are essentially localized …they do not overlap to any appreciable extent. ( 2s ) 2 NOTE : This is not the most stable form of elemental Li.
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10/19/2010 2 • What about Be 2 ? Homonuclear Diatomics in Period 2 Be 2s Be 2s 2s * 2s Be 2 Bond order = ½(2 – 2) = 0 Diatomic beryllium is not observed. Be exists as an extended solid, with many atoms bonded together in a fashion termed metallic bonding .
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oct 18 continue - 10/19/2010 Wed, 20 Oct 10 Announcements...

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