This section lists some binary compounds with halogens (known as halides), oxygen (known as oxides), hydrogen (known as hydrides), and some other compounds of holmium. For each compound, a formal oxidation number for holmium is given, but the usefulness of this number is limited forp-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.

In compounds of holmium (where known), the most common oxidation numbers of holmium are:3.

Hydrides

The term hydride is used to indicate compounds of the type M_xH_y and not necessarily to indicate that any compounds listed behave as hydrides chemically.

• none listed

Fluorides

• Holmium trifluoride: HoF₃

Chlorides

• Holmium trichloride: HoCl₃

Bromides

• none listed

Iodides

• Holmium triiodide: HoI₃

Oxides

• Diholmium trioxide: Ho₂O₃

Sulfides

• Diholmium trisulphide: Ho₂S₃

Selenides

• Diholmium triselenide: Ho₂Se₃

Tellurides

• none listed

Nitrides

• Holmium nitride: HoN

Carbonyls

• none listed

Complexes

• none listed