A negatively charged ion. Pronounced an-I-on. An anion is as opposed to a cation, which is a positively charged ion.
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An ion that carries a negative charge, going therefore to the positively charged anode; in salts, acid radicals are anions.

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an·ion 'an-.ī-ən n the ion in an electrolyzed solution that migrates to the anode broadly a negatively charged ion

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an ion of negative charge, such as a bicarbonate ion (HCO3-) or a chloride ion (Cl-) (see also electrolyte). The anion gap is the difference between the concentrations of cations (positively charged ions) and anions, calculated from the formula:
(Na+ + K+) - (HCO3- + Cl-)
It is used to estimate the unaccounted-for anions in the blood in cases of metabolic disturbance. The normal anion gap is 10-16 mmol/l.

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an·ion (anґi-on) [ana- + ion] an ion carrying a negative charge owing to a surplus of electrons; in an electrolytic cell anions migrate toward the anode, the positively charged electrode.

Medical dictionary. 2011.

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Look at other dictionaries:

  • anion — [ anjɔ̃ ] n. m. • 1842; en angl. 1834; gr. anion « ce qui s élève » ♦ Phys. Ion à charge négative qui, dans une électrolyse, se dirige vers l anode (opposé à cation). ● anion nom masculin (grec anion, ce qui s élève) Ion qui possède une charge d… …   Encyclopédie Universelle

  • anion — ANIÓN, anioni, s.m. (chim.) Ion cu sarcină negativă, care este atras de anod. [pr.: ni on] – Din fr. anion. Trimis de ana zecheru, 13.09.2007. Sursa: DEX 98  ANIÓN s. (fiz.) 1. ion negativ. 2. anion macromolecular v. macroanion …   Dicționar Român

  • Anión — Saltar a navegación, búsqueda Un anión es un ion (sea átomo o molécula) con carga eléctrica negativa, es decir, con exceso de electrones. Los aniones se describen con un estado de oxidación negativo. Las sales típicamente están formadas por… …   Wikipedia Español

  • anion — (n.) a negatively charged ion, which moves toward the ANODE (Cf. anode) (q.v.) during electrolysis, 1834, proposed by the Rev. William Whewell (1794 1866), English polymath, and published by English physicist Michael Faraday, from Gk. anion… …   Etymology dictionary

  • aníon — s. m. [Física] O mesmo que ânion. • [Brasil] Plural: aníones e aníons. • [Portugal] Plural: aníones …   Dicionário da Língua Portuguesa

  • anion — [an′ī΄ən] n. [coined by FARADAY Michael < Gr anion, thing going up, neut. prp. of anienai, to go up < ana , up + ienai, to go: see VIA] a negatively charged ion, esp. one that moves toward the anode during electrolysis: opposed to CATION… …   English World dictionary

  • Anion — An i*on, n. [Gr. ?, neut. ?, p. pr. of ? to go up; ? up + ? to go.] (Chem.) An electro negative atom or group of atoms, or the element which, in electro chemical decompositions, is evolved at the anode; opposed to {cation}. Faraday. [1913… …   The Collaborative International Dictionary of English

  • Anion — Anion. См. Анион. (Источник: «Металлы и сплавы. Справочник.» Под редакцией Ю.П. Солнцева; НПО Профессионал , НПО Мир и семья ; Санкт Петербург, 2003 г.) …   Словарь металлургических терминов

  • Anion — (a. Geogr.), s. Änia …   Pierer's Universal-Lexikon

  • Anion — Anion, s. Elektrolyse …   Meyers Großes Konversations-Lexikon

  • Anion — Anion, nach Faradays Bezeichnung der elektronegative Bestandteil eines Elektrolyts; s. Elektrolyse …   Lexikon der gesamten Technik

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