Tha structar bipyramidal pentagonal neo-àbhaisteach aige, mar a chaidh a ro-innse le teòiridh VSEPR. Faodaidh am moileciuil ath-sheasamh pseudorotational a dhèanamh ris an canar meacanachas Bartell, a tha coltach ri meacanachas Berry ach airson siostam heptacoordinated. Ceist: Dè an cruth a th 'aig heptafluoride iodine a thaobh teòiridh VSEPR?
structar bipyramidal pentagonal