Monoxide
{{Short description|Any oxide containing only one atom of oxygen.}}
{{ About|chemistry|the rapper|Monoxide Child}}File:Carbon monoxide 2D.svgA monoxide is any oxide containing only one atom of oxygen. A well known monoxide is carbon monoxide; see carbon monoxide poisoning.
The prefix mono (Greek for "one") is used in chemical nomenclature.{{Cite book|title=Foundations of College Chemistry, 13th Edition|publisher=Wiley|year=2010|isbn=978-0470460610|pages=110}} In proper nomenclature, the prefix is not always used in compounds with one oxygen atom.{{Cite book|title=Nomenclature of Inorganic Chemistry, IUPAC Recommendations 2005|year=2005 |isbn=0-85404-438-8|pages=69, 70}} Generally, when the oxygen is bonded to a nonmetal, the prefix mono is used. However, when the oxygen atom bonds to a metal, the prefix is dropped. For instance, in the compound K2O, potassium (K) is a metal and therefore its proper name is potassium oxide, rather than potassium monoxide.
Among monoxides, carbon monoxide and dihydrogen monoxide (water) are both neutral, germanium(II) oxide is distinctly acidic, and both tin(II) oxide and lead(II) oxide are amphoteric.