L13-Interactions_of_Atoms

L13-Interactions_of_Atoms - Part II Interactions of Atoms:...

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Part II Interactions of Atoms: Valence Bond Theory Prediction of 3D Arrangement V alence S hell E lectron P air R epulsion Theory VSEPR used to predict the spatial arrangement of atoms in a molecule or polyatomic ion models where bonding occurs and where unshared electrons are directed, not how Prediction of 3D Arrangement Valence Bond Theory used to predict the spatial arrangement of atoms in a molecule or polyatomic ion and bond strength based on the interactions of atomic orbitals has to be consistent with experimental observations consistent with VESPR Theory Valence Bond Theory covalent bonds form when orbitals of two atoms overlap the overlap region is occupied by a pair of electrons the electrons must have opposite spins 1 2 3 4
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Valence Bond Theory strength of the covalent bond depends on attraction of nuclei for the shared electrons more overlap, stronger bond dependent on shapes and directions of orbitals s orbitals Orbital Refresher p orbitals spherical equal electron density no directionality lobed (dumbbell shaped) unequal electron density directionality Developing Bonding Theories The theory has to be consistent with the facts and observations not the other way around experiments are done Frst, explanations and models are developed second. all should be consistent to be accepted by the
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L13-Interactions_of_Atoms - Part II Interactions of Atoms:...

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