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Ex3ReviewUP_B2 - Molecular Orbital (MO) Theory &...

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Unformatted text preview: Molecular Orbital (MO) Theory & Bond order There are some concepts better represented by There molecular orbitals. In MO theory, we invoke the wave nature of electrons. nature If waves interact constructively, the resulting orbital is If lower in energy: a bonding molecular orbital. lower If waves interact destructively, the resulting orbital is If higher in energy: an antibonding molecular orbital. higher Know the difference between the number of bonding Know and antibonding electrons, and how to calculate bond order ! order MO Theory For atoms with both s and p orbitals, there are two For types of interactions: types The s and the p orbitals that face each other The overlap in σ fashion. The other two sets of p orbitals overlap in π The fashion. fashion. MO Theory The resulting MO diagram looks like this. There are both σ and π bonding molecular orbitals There and σ* and π * antibonding molecular orbitals. and The smaller p-block elements in the second period have a sizeable interaction between the s and p orbitals. This flips the order of the s and p molecular orbitals in these elements. Second-Row MO Diagrams ...
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This note was uploaded on 11/07/2009 for the course CHM 114 taught by Professor Aksyonov during the Spring '08 term at ASU.

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