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The Lewis structure of H3O+ shows the central oxygen atom bonded to three hydrogen atoms and bearing a positive charge. The electron geometry is tetrahedral as there are four electron domains (three bonds and one lone pair) around the oxygen. The molecular geometry is trigonal pyramidal due to the lone pair. The hybridization of the oxygen atom is sp3. The molecule is polar due to the asymmetrical arrangement of the bonds and lone pair, creating a dipole moment.