Definition of Anion

(n.)
An electro-negative element, or the element which, in electro-chemical decompositions, is evolved at the anode; -- opposed to cation.
  

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anion
\an"i*on\ (&?;), n. [gr. &?;, neut. &?;, p. pr. of &?; to go up; &?; up + &?; to go.] (chem.) an electro-negative element, or the element which, in electro-chemical decompositions, is evolved at the anode; -- opposed to cation.

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Noun
1. a negatively charged ion
(hypernym) ion
(hyponym) hydroxide ion, hydroxyl ion

(See ion.)

a negatively charged ion.

A negatively charged ion.

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Compare with cation .An anion is a negatively charged ion. Nonmetals typically form anions.

An ion having a negative charge.

: An ion having a negative charge.

A negatively charged ion.

A negatively charged ion such as the chloride ion (Cl-).

a negatively charged non-metallic ion.

Strong anion exchanger. A typical strong anion exchange functional group would be tetra-alkyl-ammonium .

Weak anion exchanger. Ionizable groups such as primary, secondary or tertiary amino groups on a packing are considered to be weak.

a negatively charged ion, i.e., an ion that migrates to the anode in an electrolyzed solution.

In an electrolyzed solution, the negatively charged particle, or ion, which travels to the anode and is therefore discharged, evolved, or deposited. Also, by extension, any negative ion. Anions are opposed to cations, which carry a positive charge. There must be equal amounts of positive and negative charged ions in any water sample. Following are the common anions in their order of decreasing concentration for most lakes: bicarbonate (HCO3-), Sulfate(SO4--), chloride (Cl-), carbonate (CO3--), nitrate (NO3-), Nitrite (NO2-), and phosphates (H2PO4-, HPO4--, and PO4-- ).

  A negatively charged ion in an electrolyte solution, attracted to the anode under the influence of a difference in electrical potential. Chloride (CI-) is an anion.

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A negatively charged ion such as a chloride ion, C1-.