ion

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Related to Dianion: Anions

ion

 [i´on]
an atom or group of atoms having a positive (cation) or negative (anion) electric charge by virtue of having gained or lost an electron; substances forming ions are called electrolytes. adj., adj ion´ic.
dipolar ion an ion that has both positive and negative regions of charge.
hydrogen ion the positively charged hydrogen atom (H+), which is the positive ion of all acids. See also hydrogen ion concentration.
hydroxyl ion the negatively charged group, OH, present to excess in alkaline solutions.

i·on

(ī'on),
An atom or group of atoms carrying an electric charge by virtue of having gained or lost one or more electrons. Ions charged with negative electricity (anions) travel toward a positive pole (anode); those charged with positive electricity (cations) travel toward a negative pole (cathode). Ions may exist in solid, liquid, or gaseous environments, although those in liquid (electrolytes) are more common and familiar.
[G. iōn, going]

ion

(i´on) an atom or molecule that has gained or lost one or more electrons and acquired a positive charge (a cation) or negative charge (an anion).ion´ic
dipolar ion  zwitterion.

ion

[ī′ən, ī′on]
Etymology: Gk, ienai, to go
an atom or group of atoms that has acquired an electrical charge through the gain or loss of an electron or electrons.

i·on

(ī'on)
An atom or group of atoms carrying an electric charge by virtue of having gained or lost one or more electrons. Ions charged with negative electricity (anions) travel toward a positive pole (anode); those charged with positive electricity (cations) travel toward a negative pole (cathode). Ions may exist in solid, liquid, or gaseous environments, although those in liquid (electrolytes) are more common and familiar.
[G. iōn, going]

ion

An electrically charged atom, group of atoms, or molecule. A positive ion is an atom that has lost an electron; a negatively charged ion is one that has gained an electron. See also IONIZATION.

ion

an atom that carries a charge due to loss or gain of electrons.

Ion

An atom or group of atoms that acquires an electrical charge by the gain or loss of electrons.

ion

atom that has lost or gained an electron (see anion; cation)

ion (īˑ·n),

n an atom or a molecule that has gained or lost electrons, thus giving rise to a charged particle. See also anion and cation.

ion

(ī'on)
An atom or group of atoms carrying an electric charge by virtue of having gained or lost one or more electrons. Ions charged with negative electricity (anions) travel toward a positive pole (anode); those charged with positive electricity (cations) travel toward a negative pole (cathode). Ions may exist in solid, liquid, or gaseous environments, although those in liquid (electrolytes) are more common and familiar.
[G. iōn, going]

ion (ī´on),

n an atomic particle, atom, or chemical radical bearing an electrical charge, either negative or positive.
ion exchange chromatography,
n the process of separating and analyzing different substances according to their affinities for chemically stable but very reactive synthetic exchangers, which are composed largely of polystyrene and cellulose. The process uses an absorbent containing ionizing groups and accommodates the exchange of ions between a solution of substances to be analyzed and the absorbent. Ion exchange chromatography is often used to separate components of nucleic acids and proteins.
ion pair,
n the two particles of opposite charge, usually the electron and the positive atomic residue resulting after the interaction of ionizing radiation with the orbital electrons of atoms. The average energy required to produce an ion pair is approximately 33 (or 34) electron volts.
ion-selective electrode,
n a potentiometric electrode that develops a potential in the presence of one ion (or class of ions), but not in the presence of a similar concentration of other ions.

ion

an atom or group of atoms having a positive (cation) or negative (anion) electric charge by virtue of having gained or lost one or more electrons. Substances forming ions are electrolytes.

ion channel
see channel.
dipolar ion
zwitterion.
hydrogen ion
the positively charged hydrogen atom (H+), present to excess in acid solutions.
ion pair
the pair of ions created when an atom has had an electron removed by ionizing radiation.
ion pump
see calcium pump, sodium pump.
ion trapping
a strategy for treatment of poisonings based on the principle that cell membranes are less permeable to ionized compounds. With knowledge of the characteristics of the toxin, treatment can be given to alter the acid-base balance in favor of ionization.
References in periodicals archive ?
00 g) in dry THF (30 ml) was added dropwise for 10 min to the dianion of ethyl acetoacetate (2.
Reffstrup and Boll (1976) reported that kavapyrones, 5,6-dehydrokawain (1) and yangonin (4) were synthesized via four steps from the dianion of ethyl acetoacetate as shown in Scheme 1.
The fungal mycelia were then separated from the broth by filtration, and the culture broth was then subjected to aromatic absorbent resin column chromatography using Dianion HP-20 and elutecl with a step gradient of [H.
The irreversibility may be attributed to the fact that the dianions are sufficiently reactive to abstract protons from the solvent.