This section lists some binary compounds with halogens (known as halides), oxygen (known as oxides), and hydrogen (known as hydrides) of francium. This section of WebElements will be expanded considerably in the future. For each compound, a formal oxidation number for francium is given, but the usefulness of this number is limited for p-block elements in particular. Based upon that oxidation number, an electronic configuration is also given but note that for more exotic compounds you should view this as a guide only. The term hydride is used in a generic sense to indicate compounds of the type MxHy and not necessarily to indicate that any compounds listed behave chemically as hydrides.
In compounds of francium (where known), the most common oxidation numbers of francium are: 1.
The term hydride is used to indicate compounds of the type MxHy and not necessarily to indicate that any compounds listed behave as hydrides chemically.