This section lists some binary compounds with halogens (known as halides), oxygen (known as oxides), hydrogen (known as hydrides), and some other compounds of selenium. For each compound, a formal oxidation number for selenium 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 selenium (where known), the most common oxidation numbers of selenium are:6, 4, 2, and -2.

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

• Selenium difluoride: SeF₂
• Diselenium difluoride: FSeSeF
• Selenium difluoride selenide: SeSeF₂
• Selenium hexafluoride: SeF₆
• Selenium tetrafluoride: SeF₄

Chlorides

• Selenium dichloride: SeCl₂
• Diselenium dichloride: Se₂Cl₂
• Tetraselenium hexadecachloride: [SeCl₄]₄

Bromides

• Selenium dibromide: SeBr₂
• Diselenium dibromide: Se₂Br₂
• Teteaselenium hexadecabromide: [SeBr₄]₄

Iodides

• none listed

Oxides

• Selenium dioxide: SeO₂
• Selenium trioxide: SeO₃

Sulfides

• Diselenium hexasulphide: Se₂S₆
• Tetraselenium tetrasulphide: Se₄S₄

Selenides

• none listed

Tellurides

• none listed

Nitrides

• Tetraselenium tetranitride: Se₄N₄

Carbonyls

• none listed

Complexes

• none listed