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Noun
1. hypervalent compoundChemistry
Wikipedia definition
2. Hypervalent moleculeA hypervalent molecule is a molecule that contains one or more main group elements formally bearing more than eight electrons in their valence shells. Phosphorus pentachloride (PCl5), sulfur hexafluoride (SF6), the phosphate (PO4) ion, chlorine trifluoride (ClF3) and the triiodide (I3) ion are examples of hypervalent molecules.
Read “Hypervalent molecule” on English Wikipedia
Read “超原子価” on Japanese Wikipedia
Read “Hypervalent molecule” on DBpedia

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