Oxoanions
Oxoanions are polyatomic ions that contain oxygen atoms bonded to a central atom, typically in a relatively high oxidation state. They are usually the conjugate bases of oxoacids and carry a negative charge. Their chemistry is shaped by resonance among the surrounding oxygen atoms and by the oxidation state of the central atom.
Prominent families of oxoanions include nitrate (NO3−) and nitrite (NO2−); sulfate (SO4^2−) and sulfite (SO3^2−); phosphate
Structurally, oxoanions often feature high-symmetry arrangements around the central atom (frequently tetrahedral or related geometries) and
Oxoanions are widespread in minerals, salts, biology, and environmental chemistry. They are central to fertilizer use