anion

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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
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) 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
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) 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.
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 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
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. 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.
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.

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 ?
Some fibrous anion exchangers were synthesized on the basis of industrially produced PAN fiber (11-18).
Cells contain enzymes that can break down reactive oxygen species: superoxide dismutases, which convert superoxide anions to hydrogen peroxide, and catalase, which splits hydrogen peroxide.
Elimination of color, odor, anions, and cations in only one stage in a very short period of time (about 30 minutes) is among the distinguished characteristics of the synthesized nanocomposite.
By producing the most powerful anion wristband on the market, we offer wearers of the band the opportunity to experience more in life, to get better sleep, find relief from chronic pain, and feel more energetic throughout the day.
As perchlorate anion does not adsorb on the nickel surface there is no significant competition between various anions for better adsorption places.
In recent years, the field of anion binding has attracted a special interest, since anions play a fundamental role in a wide range of chemical and biological process [1,2] Currently, there are several hazardous anions in the environment, such as sulfate, chloride, and perchlorate which are associated with a number of health related problems.
Our analysis has found that mutation at N 101 results in the ability of other anions such as acetate, methanesulfonate and gluconate to functionally substitute for CL in assay buffers.
5-15% weight of the composition; dissolved phosphate anions having a concentration of at least 0.
This is consistent with increased levels of "unmeasured," probably organic, anions in the urine (3).
Both organic anions and xenobiotics in the blood use the same organic anion transporters (OATs) for entry into proximal tubule cells and they then exit these cells through ATP dependent ABCC2 (MRP2) and ABCC4 (MRP4), cassette transporters located at the luminal membrane of the cells (Sekine et al.