Ch_322a_1.08

Ch_322a_1.08 - Molecular Orbitals When atoms combine to...

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Molecular Orbitals When atoms combine to form molecules, the electrons reside in molecular orbitals . Only two electrons may be placed in each molecular orbital with paired spins. Two important assumptions are: (1) Each pair of electrons resides in a localized region near the nuclei of the atoms that are forming the molecular orbital. (2) The shapes of the localized molecular orbital are related in a simple way to the shapes of the combining atomic orbitals.
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Energetics of Covalent Bond Formation The H 2 Molecule When two hydrogen atoms combine to form the hydrogen molecule, the energy changes as shown below: Energy internuclear distance (r) H . H . H-H dissociated state bonded state ..... internuclear repulsion H H attraction r = 0.74 A o covalent bond length The energy minimum is the H-H equilibrium bond length. 104 kcal/mol How does molecular orbital theory explain these energy changes?
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Molecular Orbitals from Combining Atomic Orbitals Atomic Orbitals as Probability Distributions
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Ch_322a_1.08 - Molecular Orbitals When atoms combine to...

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