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anion

   Also found in: Dictionary/thesaurus, Medical, Hutchinson 0.01 sec.
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 reduction oxidation 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 bases acids 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). Salts salt, 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


..... Click the link for more information.  are made up of anions and cations cation (kăt'ī`ən), atom or group of atoms carrying a positive charge.
..... Click the link for more information. . See ion ion, 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

Atom or group of atoms carrying a negative electric charge, indicated by a superscript minus sign after the chemical symbol. Anions in a liquid subjected to an electric field migrate toward the positive electrode (anode). Examples include hydroxyl (−OH−; see hydroxide), carbonate (−CO32−), and phosphate (−PO43−). See also ion; compare cation.
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L-55RII (co-dried aluminum-magnesium hydroxycarbonate) is an improved synthetic hydrotalcite, which has proven effective in neutralizing residual acidity in various synthetic polymers by anion exchange because of its latice-layer structure.
Lubricants and processing aids by Plastics Technology
As a starter, the sulfate anion that is the counterbalancing anion to the positively charged [Al.
Water treatment: striking a balance by Bottiglieri, Jan / Solutions - for People, Processes and Paper
Recently, Dave Beede from Michigan State summarized ration and anion feeding and found a DCAD of +25 to +30 meq/100 g of dry matter is effective and sufficient to achieve maximum feed intake and milk production even during heat stress.
Nutrition by Linn, Jim / Dairy Today
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