Valence Bond Theory's Core Claim
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Valence bond theory explains a covalent bond as the overlap of two atomic orbitals, each contributing one electron, into one shared region.
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Two hydrogen 1s orbitals overlap end to end, concentrating the bonding electron pair between the nuclei.
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Valence bond theory ties each electron's orbital to overlap between two specific atoms; Chem 1125 introduces a rival model.