ion pair

▪ chemistry and physics
      in physics and chemistry, a duplex of charged particles (ordinarily charged atoms or molecules), one positive, the other negative. An ion pair, for the physicist, is the positively charged particle (positive ion) and the negatively charged particle (negative ion) simultaneously produced by the addition of sufficient energy to a neutral atom or molecule to cause it to dissociate into oppositely charged fragments. Thus, an energetic electron passing near or through an oxygen molecule, O2, may force one of the electrons out of the molecule. The result is an ion pair consisting of the positive oxygen ion, O2+, and the negative detached electron, e-.

      An ion pair, in the context of chemistry, consists of a positive ion and a negative ion temporarily bonded together by the electrostatic force of attraction between them. Ion pairs occur in concentrated solutions of electrolytes (substances that conduct electricity when dissolved or molten). Thus, in concentrated solutions of sodium chloride, some positive sodium ions, Na+, and some negative chloride ions, Cl-, are paired together. Upon colliding, two oppositely charged ions stay together only for a short period of time. On the average, a certain population of these pairs exists at any given time, although the formation and dissociation of ion-pairs is continuous.

* * *


Universalium. 2010.

Look at other dictionaries:

  • ion pair — jonų pora statusas T sritis Standartizacija ir metrologija apibrėžtis Nepatvarus, elektros atžvilgiu neutralus priešingo ženklo krūvio jonų darinys. atitikmenys: angl. ion pair; ionic pair; quasi molecule vok. Ionenpaar, n; Ionenzwilling, m rus.… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • ion pair — jonų pora statusas T sritis fizika atitikmenys: angl. ion pair; ionic pair vok. Ionenpaar, n rus. ионная пара, f; пара ионов, f pranc. paire d’ions, f …   Fizikos terminų žodynas

  • ion pair — jonų pora statusas T sritis chemija apibrėžtis Vieno jonizacijos akto metu susidariusi priešingai įelektrintų jonų pora. atitikmenys: angl. ion pair rus. ионная пара …   Chemijos terminų aiškinamasis žodynas

  • ion pair — the free electron and the positively charged residual atom that result from the ejection of an orbital electron by ionizing radiation …   Medical dictionary

  • ion-pair yield — jonų porų išeiga statusas T sritis fizika atitikmenys: angl. ionic yield; ion pair yield vok. Ionenpaarausbeute, f rus. выход пар ионов, m pranc. rendement en paires d’ions, m …   Fizikos terminų žodynas

  • Intimate ion pair — In chemistry the intimate ion pair concept introduced by Saul Winstein describes the interactions between a cation, anion and surrounding solvent molecules.[1] In ordinary aqueous solutions of inorganic salts an ion is completely solvated and… …   Wikipedia

  • primary ion pair — pirminė jonų pora statusas T sritis fizika atitikmenys: angl. primary ion pair; primary ionic pair vok. primäres Ionenpaar, n rus. первичная пара ионов, f pranc. paire d’ions primaire, f …   Fizikos terminų žodynas

  • average energy loss per ion pair formed — vidutiniai jonų porinimosi energijos nuostoliai statusas T sritis fizika atitikmenys: angl. average energy loss per ion pair formed rus. средняя энергия ионообразования, f pranc. perte moyenne d’énergie par paire d’ions, f …   Fizikos terminų žodynas

  • ion-exchange reaction — ▪ chemical reaction Introduction       any of a class of chemical reactions between two substances (each consisting of positively and negatively charged species called ions (ion)) that involves an exchange of one or more ionic components.… …   Universalium

  • Ion (comics) — Superherobox| caption=The Ion entity, extracted by force from host Kyle Rayner by Sinestro. Art by Ethan Van Sciver. character name=Ion publisher=DC Comics debut= As Kyle Rayner: Green Lantern vol. 3, #142 Revealed as Creature: Green Lantern:… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.