anion


Also found in: Dictionary, Thesaurus, Medical, Wikipedia.
Related to anion: anion exchange, anion gap

anion

(ăn`ī'ən), atom or group of atoms carrying a negative charge. The charge results because there are more electrons than protons in the anion. Anions can be formed from nonmetals by reduction (see oxidation and reductionoxidation and reduction,
complementary chemical reactions characterized by the loss or gain, respectively, of one or more electrons by an atom or molecule. Originally the term oxidation
..... Click the link for more information.
) or from neutral acids (see acids and basesacids and bases,
two related classes of chemicals; the members of each class have a number of common properties when dissolved in a solvent, usually water. Properties
..... Click the link for more information.
) or polar compounds by ionization. Anionic species include Cl, SO4−−, and CH3COO. Highly colored intermediates in organic reactions are often radical anions (anions containing an unpaired electron). Saltssalt,
chemical compound (other than water) formed by a chemical reaction between an acid and a base (see acids and bases). Characteristics and Classification of Salts

The most familiar salt is sodium chloride, the principal component of common table salt.
..... Click the link for more information.
 are made up of anions and cationscation
, atom or group of atoms carrying a positive charge. The charge results because there are more protons than electrons in the cation. Cations can be formed from a metal by oxidation (see oxidation and reduction), from a neutral base (see acids and bases) by protonation, or
..... Click the link for more information.
. See ionion,
atom or group of atoms having a net electric charge. Positive and Negative Electric Charges

A neutral atom or group of atoms becomes an ion by gaining or losing one or more electrons or protons.
..... Click the link for more information.
.

anion

[′a‚nī·ən]
(chemistry)
An ion that is negatively charged.

anion

a negatively charged ion; an ion that is attracted to the anode during electrolysis
References in periodicals archive ?
Effect of dietary cation anion difference on incidence post parturient problems of transition Sahiwal dairy cattle.
Thus, a Na-dichromate extraction study was also conducted to scrutinize the anion transfer properties of the synthesized compounds, in addition to metal picrate extraction studies.
To ensure this high OH--loading is maintained over a long period during transportation and storage, the anion exchange resin must be protected against carbon dioxide, as bound hydrogen carbonate would otherwise form.
Typical findings of type 1 distal RTA (dRTA) include low serum bicarbonate, normal serum anion gap, hyperchloremia and hypokalemia.
At the same time, the ratio of [DELTA] anion gap to [DELTA] HC[O.
El anion gap esta determinado por la diferencia que existe entre las concentraciones de cationes (iones de carga positiva) y aniones (iones de carga negativa) en la sangre, plasma u orina (1,12).
Given the improving anion gap and the lack of clinically relevant acidemia, there was debate about whether this patient had actually ingested ethylene glycol (EG) or had instead ingested propylene glycol (found in "safer" antifreezes) or isopropyl alcohol.
Some fibrous anion exchangers were synthesized on the basis of industrially produced PAN fiber (11-18).
Anion gap metabolic acidosis and non-anion gap metabolic acidosis