ion (redirected from ionised)

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

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dipolar ion  zwitterion.

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i·on (n, n)

n.

An atom or a group of atoms that has acquired a net electric charge by gaining or losing one or more electrons.

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Ion

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

Mentioned in: Electrolyte Supplements

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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.

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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.

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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.

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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.

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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.