An oxyanion or oxoanion is a negatively charged polyatomic ion that contains oxygen. Every oxyanion is the conjugate base of an oxyacid. A polyatomic ion is an ion consisting of a molecule with covalently bonded atoms or of a metal complex that can be considered as acting as a single unit in the context of acid/base chemistry or in the formation of salts. ... General Name, Symbol, Number oxygen, O, 8 Chemical series Nonmetals, chalcogens Group, Period, Block 16, 2, p Appearance colorless (gas) very pale blue (liquid) Atomic mass 15. ... In the field of chemistry, in the Brønsted-Lowry (protonic) theory of acids and bases, a conjugate base is the basic member, X-, of a pair of compounds that differ only by the presence or absence of a proton at a certain position. ... An oxoacid is an acid which contains oxygen. ...

Some elements (both metals and nonmetals) form several oxyanions with different numbers of oxygen atoms or different charges. These oxyanions and their conjugate oxyacids are named according to the oxidation state of the non-oxygen atom, for example the four oxyanions of chlorine: Hot metal work from a blacksmith In chemistry, a metal (Greek: Metallon) is an element that readily forms positive ions (cations) and has metallic bonds. ... Together with the metals and metalloids, a nonmetal is one of three categories of chemical elements as distinguished by ionization and bonding properties. ... General Name, Symbol, Number oxygen, O, 8 Chemical series Nonmetals, chalcogens Group, Period, Block 16, 2, p Appearance colorless (gas) very pale blue (liquid) Atomic mass 15. ... Properties In chemistry and physics, an atom (Greek ἄτομος or átomos meaning indivisible) is the smallest particle of a chemical element that retains its chemical properties. ... Look up charge in Wiktionary, the free dictionary. ... An oxoacid is an acid which contains oxygen. ... In chemistry, the oxidation state is a measure of the degree of oxidation of an atom in a chemical compound. ... General Name, Symbol, Number oxygen, O, 8 Chemical series Nonmetals, chalcogens Group, Period, Block 16, 2, p Appearance colorless (gas) very pale blue (liquid) Atomic mass 15. ... Properties In chemistry and physics, an atom (Greek ἄτομος or átomos meaning indivisible) is the smallest particle of a chemical element that retains its chemical properties. ... General Name, Symbol, Number chlorine, Cl, 17 Chemical series halogens Group, Period, Block 17, 3, p Appearance yellowish green Atomic mass 35. ...

In general, the oxidation states may be different from these, but the order of the prefixes and suffixes remains the same. An anion is an ion with negative charge. ... In mathematics and in the sciences, a formula is a concise way of expressing information symbolically (as in a mathematical or chemical formula), or a general relationship between quantities. ... Within the Brønsted-Lowry (protonic) theory of acids and bases, a conjugate acid is the acid member, HX, of a pair of two compounds that transform into each other by gain or loss of a proton. ... In chemistry, the oxidation state is a measure of the degree of oxidation of an atom in a chemical compound. ... The most fundamental reactions in chemistry are the redox processes. ...