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 ?
The anionically polymerized polyisoprene has the highest elongation at break, the natural robber sample the lowest.
For example, CL can be polymerized anionically above 100 [degrees] C in the presence of a catalyst such as NaCL.
The acrylic copolymer included a small amount of copolymerized acid-functional monomer, and the dispersions were neutralized with an organic amine base to a pH of 8-9, so that in each case the materials used in coating formulations were anionically stabilized.
He will track the progress which began with the novel, proprietary Captisol([R]) technology, one of a series of anionically charged sulfobutyl ether -cyclodextrins (SBE-CDs) that were originally synthesized and patented by scientists from the University of Kansas Higuchi Biosciences Center.
Key statement: Oligomer-modified anionically polymerized polymers, reinforced materials made with the polymers and articles made from the reinforced materials are provided.
7) The PVDF latex dispersions are anionically stabilized, and can be combined with water-based pigment dispersions, and formulated with common coatings additives designed for waterborne coatings, similarly to the way acrylic latexes are formulated.
It has been shown that MAH can be homopolymerized [15] with [gamma] and ultraviolet radiation [16, 17] in the presence of radical initiators, anionically with various bases, electrochemically, and under shock waves.