CH 101 Chapter Notes - Chapter 7: Valence Bond Theory, Trigonal Bipyramidal Molecular Geometry, Orbital Hybridisation

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Liquid oxygen is one of few magnetic liquids: the unpaired electrons are responsible for the magnetic behavior. Section 7. 2: valence bond theory: orbital overlap as a chemical bond. Valence bond theory- a chemical bond is the overlap between two half-filled atomic orbitals: treats valence electrons as residing in quantum-mechanical atomic orbitals. Orbitals can be the standard s, p, d, and f orbitals, or they may be hybrid combinations of these. Usually negative when the interacting atomic orbitals contain a total of two electrons. Section 7. 3: valence bond theory: hybridization of atomic orbitals that can spin-pair (orient with opposing spins) The overlap of orbitals lowers the potential energy of the electrons in those orbitals: the greater the overlap, the lower the energy, and the stronger the bond. Hybrid orbitals allow greater overlap because the electron density in a hybrid orbital is concentrated along a single directional lobe.

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