Definition of "hypervalent" []

• Having a higher than normal valence (adjective)

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• "A series of logical steps, originally discussed as postings and comments to two blogs, led to the outcome described here of a central hypervalent atom bound on one face by a small cyclic carbon ligand, with the other free face having an interaction to a helium atom with the topological properties of a charge-shift rather than a covalent bond."
• "These nanoparticles are selectively oxidized by the hypervalent iodine species PhICl"