Editing Hypervalent molecule (section)

{{short description|Molecule containing main group elements with more than eight valence electrons}}

In [[chemistry]], a '''hypervalent molecule''' (the phenomenon is sometimes colloquially known as '''expanded [[Octet rule|octet]]''') is a [[molecule]] that contains one or more [[main group element]]s apparently bearing more than eight [[electron]]s in their [[valence shell]]s. [[Phosphorus pentachloride]] ({{chem2|PCl5}}), [[sulfur hexafluoride]] ({{chem2|SF6}}), [[chlorine trifluoride]] ({{chem2|ClF3}}), the [[chlorite]] ({{chem2|ClO2-}}) ion in [[chlorous acid]] and the [[triiodide]] ({{chem2|I3-}}) ion are examples of hypervalent molecules.