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(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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An ion that is negatively charged.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


a negatively charged ion; an ion that is attracted to the anode during electrolysis
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005


(1) (IDL On the Net) See IDL.

(2) (ION) An NVIDIA graphics platform typically used in Atom-based netbooks. See Intel Atom.

(3) An ion is an atom with fewer or greater electrons than normal as a result of radiation or chemical reaction. A positive ion, called a "cation" (pronounced "cat-eye-en"), has one or more electrons stripped out, which means it has fewer electrons in its electron shells than it has protons in its nucleus. A negative ion, called an "anion" (pronounced "an-eye-en"), is an atom that has one or more electrons forcibly added.

Cations, Anions, Cathodes and Anodes
Although one might think cations are in cathodes and anions are in anodes, the opposite is true. When the terms were coined, the concept was that positive cations were attracted to the negative cathode, and negative anions were attracted to the positive anode.

Batteries Contain Positive and Negative Ions
In a battery, there are positive ions on one side and negative ions on the other. When a conductor is placed in between to complete the circuit, the electrons flow from the negative ions to the positive side where they join the positive ions. See ion deposition.
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References in periodicals archive ?
The anionically polymerized polyisoprene has the highest elongation at break, the natural robber sample the lowest.
High PVC fast-drying aqueous binder compositions with small particle binders and traffic markings made therewith (provides fast dry binder compositions comprising one or more anionically stabilized emulsion polymer having a weight average particle size of from 100 to 165 nm, one or more polyamine, one or more volatile base and one or more filler, extender and/or pigment in a composition having a %PVC of from 63 to 80.
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.
Two different SBM triblock copolymers with different block ratios and molar masses, synthesized anionically at pilot scale by Arkema were used.
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.
The sample has been anionically synthesized and is nearly monodisperse with molecular weight [M.sub.w] = 96,500 and polydispersity index [M.sub.w]/[M/sub.n] = 1.16 (industrial grade produced by Eni-Versalis SpA).
Key statement: An initiator is presented for anionically polymerizing monomers, to provide a functional head group on the polymer.
For example, CL can be polymerized anionically above 100 [degrees] C in the presence of a catalyst such as NaCL.