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Qu'est-ce (qui) est ion - définition
Ion (mythology)
MYTHICAL SON OF APOLLO
Ion (Greek mythology); Ion (mythological figure); Ion of Helike; Ionas; Íon
According to Greek mythology, Ion (; , Íon, gen.: Ἴωνος, Íonos, "going") was the illegitimate child of Creüsa, the daughter of Erechtheus and wife of Xuthus.
ion
![[[Hydrogen atom]] (center) contains a single [[proton]] and a single [[electron]]. Removal of the electron gives a cation (left), whereas the addition of an electron gives an anion (right). The hydrogen anion, with its loosely held two-electron cloud, has a larger radius than the neutral atom, which in turn is much larger than the bare proton of the [[cation]]. Hydrogen forms the only charge-+1 cation that has no electrons, but even cations that (unlike hydrogen) retain one or more electrons are still smaller than the neutral atoms or molecules from which they are derived.](https://commons.wikimedia.org/wiki/Special:FilePath/Ions.svg?width=200 "[[Hydrogen atom]] (center) contains a single [[proton]] and a single [[electron]]. Removal of the electron gives a cation (left), whereas the addition of an electron gives an anion (right). The hydrogen anion, with its loosely held two-electron cloud, has a larger radius than the neutral atom, which in turn is much larger than the bare proton of the [[cation]]. Hydrogen forms the only charge-+1 cation that has no electrons, but even cations that (unlike hydrogen) retain one or more electrons are still smaller than the neutral atoms or molecules from which they are derived.")
![Equivalent notations for an [[iron]] atom (Fe) that lost two electrons, referred to as [[ferrous]].](https://commons.wikimedia.org/wiki/Special:FilePath/Ions notation.svg?width=200 "Equivalent notations for an [[iron]] atom (Fe) that lost two electrons, referred to as [[ferrous]].")
![Mixed Roman numerals and charge notations for the [[uranyl]] ion. The oxidation state of the metal is shown as superscripted Roman numerals, whereas the charge of the entire complex is shown by the angle symbol together with the magnitude and sign of the net charge.](https://commons.wikimedia.org/wiki/Special:FilePath/Ions notation2.svg?width=200 "Mixed Roman numerals and charge notations for the [[uranyl]] ion. The oxidation state of the metal is shown as superscripted Roman numerals, whereas the charge of the entire complex is shown by the angle symbol together with the magnitude and sign of the net charge.")
![2NO3-}}). The 3-dimensional shell represents a single arbitrary [[isopotential]].](https://commons.wikimedia.org/wiki/Special:FilePath/Nitrate-ion-elpot.png?width=200 "2NO3-}}). The 3-dimensional shell represents a single arbitrary [[isopotential]].")
ATOM OR MOLECULE IN WHICH THE TOTAL NUMBER OF ELECTRONS IS NOT EQUAL TO THE TOTAL NUMBER OF PROTONS, GIVING THE ATOM A NET POSITIVE OR NEGATIVE ELECTRICAL CHARGE
Cation; Anion; Anionic; Cationic; Ions; Negative ions; Cations; Anions; Ion (physics); Negative atomic ion; Charge (chemistry); Oxo anion; Ion (chemistry); Ion notation; Nonionic; Negative ion; Positive ions; Cathion; Kation; Ionical; Ionic charge; Positive ion; Non-ionic; Free floating electrons; Anions and cations; Cations and anions
(ions)
Ions are electrically charged atoms. (TECHNICAL)
N-COUNT: usu pl
Ion
ATOM OR MOLECULE IN WHICH THE TOTAL NUMBER OF ELECTRONS IS NOT EQUAL TO THE TOTAL NUMBER OF PROTONS, GIVING THE ATOM A NET POSITIVE OR NEGATIVE ELECTRICAL CHARGE
Cation; Anion; Anionic; Cationic; Ions; Negative ions; Cations; Anions; Ion (physics); Negative atomic ion; Charge (chemistry); Oxo anion; Ion (chemistry); Ion notation; Nonionic; Negative ion; Positive ions; Cathion; Kation; Ionical; Ionic charge; Positive ion; Non-ionic; Free floating electrons; Anions and cations; Cations and anions
·noun One of the elements which appear at the respective poles when a body is subjected to electro-chemical decomposition. ·cf. Anion, Cation.
II. Ion ·add. ·noun One of the electrified particles into which, according to the electrolytic dissociation theory, the molecules of electrolytes are divided by water and other solvents. An ion consists of one or more atoms and carries a unit charge of electricity, 3.4 x 10-10 electrostatic units, or a multiple of this. Those which are positively electrified (hydrogen and the metals) are called cations; negative ions (hydroxyl and acidic atoms or groups) are called anions.
III. Ion ·add. ·noun One of the small electrified particles into which the molecules of a gas are broken up under the action of the electric current, of ultraviolet and certain other rays, and of high temperatures. To the properties and behavior of ions the phenomena of the electric discharge through rarefied gases and many other important effects are ascribed. At low pressures the negative ions appear to be electrons; the positive ions, atoms minus an electron. At ordinary pressures each ion seems to include also a number of attached molecules. Ions may be formed in a gas in various ways.
Exemples du corpus de texte pour ion
1. It has chloride ion of 2,'07.72 milligrams, sodium ion of 1,60'.3 milligrams and calcium ion of 301.6 milligrams per liter as its main ion components.
2. They also produce negative ion and micro current in combination with natural minerals, which neutralize the positive ion.
3. The water per liter contains 17 mg of metasilicic acid, 2 mg of hydrogen sulphide, 1,150 mg of chloride–ion, 4'0 mg of hydrocarbonate acid–ion and 800–'00 mg of sodium–ion.
4. The system is powered by a rechargeable lithium–ion battery.
5. "Ion propulsion provides acceleration with patience," Rayman said.