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 ?
Due to their toxicity these anions are significant pollutants of soil and water.
The system also owes this high efficiency to a special process for reloading the anion exchange resin used, which results in a hydroxide ion loading of over 90 percent.
Following anion-exchange, these reflections shift toward lower angles, which suggests that the inorganic/ organic inhibitor anions are intercalated in the galleries of LDH layers, in agreement with previous data.
Keywords: Arterial blood gases (ABGs), Acid base disorder (ABD), Anion gap (AG).
Como hallazgos positivos: valor elevado de anion gap con DIF bajo y lactato normal.
It is interesting to prepare a new type of organic-inorganic anion exchange composite fibers (AECFs) based on PAN and silica gel by an ecofriendly route.
Anion gap metabolic acidosis and non-anion gap metabolic acidosis
As perchlorate anion does not adsorb on the nickel surface there is no significant competition between various anions for better adsorption places.
Key words: Inorganic anions, Ion chromatography, Suppressed conductivity detection, Water contamination, Drinking water, WHO guidelines.
A number of factors which make the anions more difficult for binding to synthetic receptors than the cations, are size, shape and free energy of solvation.