Hypervalent molecule
Molecule containing main group elements with more than eight valence electrons / From Wikipedia, the free encyclopedia
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In chemistry, a hypervalent molecule (the phenomenon is sometimes colloquially known as expanded octet) is a molecule that contains one or more main group elements apparently bearing more than eight electrons in their valence shells. Phosphorus pentachloride (PCl5), sulfur hexafluoride (SF6), chlorine trifluoride (ClF3), the chlorite (ClOā2) ion, and the triiodide (Iā3) ion are examples of hypervalent molecules.