- ammoniums20
- coniums15
- decamethoniums28
- diazoniums25
- euphoniums21
- harmoniums20
- hexamethoniums33
- hydroniums20
- ioniums12
- meconiums20
- muoniums17
- oogoniums16
- pandemoniums25
- pelargoniums23
- peponiums20
- phosphoniums27
- plutoniums20
- polemoniums23
- poloniums18
- positroniums20
- stramoniums19
- sulfoniums20
- zirconiums27