Nickel(III) oxide ( Ni₂O₃) has been referred to in the literature but is not a well characterised compound. The substance black nickel oxide is sometimes described as being Ni₂O₃ however the composition quoted by suppliers has a nickel content of around 77% by weight whereas Ni₂O₃ would have 70.98% Ni by weight, and may be non-stoichiometric NiO.

Copper(II) sulfide is a chemical compound of copper and sulfur. It occurs in nature as the dark indigo blue mineral covellite. It is a moderate conductor of electricity. A black colloidal precipitate of CuS is formed when hydrogen sulfide, H₂S, is bubbled through solutions of Cu(II) salts. It is one of number of binary compounds of copper and sulfur (see copper sulfide). It has attracted interest because of its potential uses in catalysis and photovoltaics

Silver subfluoride (Ag₂F) is a metal halide used in dental alloys. It is made by leaving metallic silver in contact with silver fluoride in the dark. It forms small crystals with a bronze reflex, and is a good conductor of electricity. On contact with water almost instant hydrolysis with precipitation of silver (Ag) powder.

Copper(II) oxide or cupric oxide (CuO) is the higher oxide of copper. As a mineral, it is known as tenorite.

Silver sulfide (or Silver sulphide in British English), Ag₂S, is the sulfide of silver. It is black and constitutes the tarnish that forms on silver when exposed to the hydrogen sulfide of the atmosphere. It is found in nature as the minerals argentite and acanthite. When formed on electrical contacts operating in an atmosphere rich in hydrogen sulfide, long filaments known as Silver Whiskers can form.

Disulfur dichloride is the chemical compound with the formula S₂Cl₂. Some alternative names for this compound are sulfur monochloride (the name implied by its empirical formula, SCl), disulphur dichloride (British English Spelling) and sulphur monochloride (British English Spelling). S₂Cl₂ has the structure implied by the formula Cl-S-S-Cl, wherein the angle between the Cl^a-S-S and S-S-Cl^b planes is 90°. This structure is referred to as gauche, and is akin to that for H₂O₂. A different isomer of S₂Cl₂ is S=SCl₂; this isomer forms transiently when S₂Cl₂ is exposed to UV-radiation.

Yttrium barium copper oxide, often abbreviated YBCO, is a chemical compound with the formula YBa₂Cu₃O₇. This material, a famous "high-temperature superconductor", achieved prominence because it was the first material to achieve superconductivity above the boiling point of nitrogen.

Silver(I,III) oxide is a chemical compound used as part of the manufacture of silver oxide-zinc alkaline batteries. It has an empirical formula AgO, which might suggest that silver is in the +2 oxidation state. However, AgO is diamagnetic and X-ray diffraction studies show that silver atoms have two different coordination environments, one having two collinear oxide neighbours and the other four coplanar oxide neighbours.. AgO is therfore formulated as Ag^IAg^IIIO₂. It is also known as silver peroxide, although it does not have peroxide (O₂²⁻) anions. It can be prepared by the slow addition of a silver(I) salt to a persulfate solution e.g. AgNO₃ to a Na₂S₂O₈ solution.

Thallium triiodide is a chemical compound of thallium and iodine with formula TlI₃. Unlike the other thallium trihalides, which contain thallium(III), TlI₃ is a thallium(I) compound and contains the triiodide ion, I₃^−.

Lithium oxide (Li₂O) or lithia is an inorganic chemical compound. Lithium oxide is formed along with small amounts of lithium peroxide when lithium metal is burned in the air and combines with oxygen: