An ION (/ˈaɪən, -ɒn/ ) is an atom , or a molecule , in which the total number of electrons is not equal to the total number of protons , giving the atom or molecule a net positive or negative electrical charge . An atom, or molecule, with a net positive charge is a cation . An atom, or molecule, with a net negative charge is an anion . Because of their opposite electric charges, cations and anions attract each other and readily form ionic compounds , such as salts .
Ions can be created by chemical means, such as the dissolution of a salt into water, or by physical means, such as passing a direct current through a conducting solution, which will dissolve the anode via ionization .
Ions consisting of only a single atom are atomic or monatomic ions . If they consist of two or more atoms, then they are called either molecular ions , or polyatomic ions .
In the case of physical ionization of a medium, such as a gas, what are known as "ion pairs" are created by ion impact, and each pair consists of a free electron and a positive ion.
* 1 History of discovery
* 2 Characteristics
* 2.1 Anions and cations
* 2.2 Natural occurrences
* 2.2.1 Astronomical
* 3 Related technology
* 3.1 Detection of ionizing radiation
* 4 Chemistry
* 4.1 Notation
* 4.1.1 Denoting the charged state * 4.1.2 Sub-classes
* 4.2 Formation
* 4.2.1 Formation of monatomic ions * 4.2.2 Formation of polyatomic and molecular ions * 4.2.3 Ionization potential
* 4.3 Ionic bonding * 4.4 Common ions
* 5 See also * 6 References
HISTORY OF DISCOVERY
The word _ion_ comes from the Greek word ἰόν, _ion_, "going", the present participle of ἰέναι, _ienai_, "to go". This term was introduced by English physicist and chemist Michael Faraday in 1834 for the then-unknown species that _goes_ from one electrode to the other through an aqueous medium. Faraday did not know the nature of these species, but he knew that since metals dissolved into and entered a solution at one electrode, and new metal came forth from a solution at the other electrode, that some kind of substance moved through the solution in a current, conveying matter from one place to the other.
Faraday also introduced the words _anion_ for a negatively charged ion, and _cation_ for a positively charged one. In Faraday's nomenclature, cations were named because they were attracted to the cathode in a galvanic device and anions were named due to their attraction to the anode .
Svante Arrhenius put forth, in his 1884 dissertation, his explanation of the fact that solid crystalline salts disassociate into paired charged particles when dissolved, for which he would win the 1903 Nobel Prize in Chemistry. Arrhenius' explanation was that in forming a solution, the salt dissociates into Faraday's ions. Arrhenius proposed that ions formed even in the absence of an electric current.
Ions in their gas-like state are highly reactive, and do not occur in large amounts on Earth, except in flames, lightning, electrical sparks, and other plasmas .
These gas-like ions rapidly interact with ions of opposite charge to give neutral molecules or ionic salts. Ions are also produced in the liquid or solid state when salts interact with solvents (for example, water) to produce "solvated ions," which are more stable, for reasons involving a combination of energy and entropy changes as the ions move away from each other to interact with the liquid. These stabilized species are more commonly found in the environment at low temperatures. A common example is the ions present in seawater, which are derived from the dissolved salts.
All ions are charged, which means that like all charged objects they are:
* attracted to opposite electric charges (positive to negative, and vice versa), * repelled by like charges * when moving, travel in trajectories that are deflected by a magnetic field .
Electrons, due to their smaller mass and thus larger space-filling properties as matter waves , determine the size of atoms and molecules that possess any electrons at all. Thus, anions (negatively charged ions) are larger than the parent molecule or atom, as the excess electron(s) repel each other, and add to the physical size of the ion, because its size is determined by its electron cloud . As such, in general, cations are smaller than the corresponding parent atom or molecule due to the smaller size of its electron cloud. One particular cation (that of hydrogen) contains no electrons, and thus consists of a single proton - _very much smaller_ than the parent hydrogen atom.
ANIONS AND CATIONS
Hydrogen atom (center) contains a single proton and a single electron . Removal of the electron gives a cation (left), whereas 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 cation that has no electrons, but even cations that (unlike hydrogen) still retain one or more electrons are still smaller than the neutral atoms or molecules from which they are derived. "Cation" and "Anion" redirect here. For the particle physics/quantum computing concept, see Anyon . For other uses, see Ion (other) .
Since the electric charge on a proton is equal in magnitude to the charge on an electron, the net electric charge on an ion is equal to the number of protons in the ion minus the number of electrons.
An ANION (−) (/ˈæn.aɪ.ən/ _AN-eye-ən_ ), from the Greek word ἄνω (_ánō_), meaning "up", is an ion with more electrons than protons, giving it a net negative charge (since electrons are negatively charged and protons are positively charged).
A CATION (+) (/ˈkæt.aɪ.ən/ _KAT-eye-ən_ ), from the Greek word κάτω (_káto_), meaning "down", is an ion with fewer electrons than protons, giving it a positive charge.
There are additional names used for ions with multiple charges. For example, an ion with a −2 charge is known as a dianion and an ion with a +2 charge is known as a dication . A zwitterion is a neutral molecule with positive and negative charges at different locations within that molecule.
Cations and anions are measured by their ionic radius and they differ in relative size: "Cations are small, most of them less than 10−10 m (10−8 cm) in radius. But most anions are large, as is the most common Earth anion, oxygen . From this fact it is apparent that most of the space of a crystal is occupied by the anion and that the cations fit into the spaces between them."
A cation has radius less than 0.8 × 10−10 m (0.8 Å) while an anion has radius greater than 1.3 × 10−10 m (1.3 Å).
Further information: List of oxidation states of the elements
Ions are ubiquitous in nature and are responsible for diverse phenomena from the luminescence of the Sun to the existence of the Earth's ionosphere . Atoms in their ionic state may have a different colour from neutral atoms, and thus light absorption by metal ions gives the colour of gemstones . In both inorganic and organic chemistry (including biochemistry), the interaction of water and ions is extremely important; an example is the energy that drives breakdown of adenosine triphosphate (ATP ). The following sections describe contexts in which ions feature prominently; these are arranged in decreasing physical length-scale, from the astronomical to the microscopic.
A collection of non-aqueous gas-like ions, or even a gas containing a proportion of charged particles, is called a plasma. Greater than 99.9% of visible matter in the Universe may be in the form of plasmas . These include our Sun and other stars and the space between planets , as well as the space in between stars . Plasmas are often called the _fourth state of matter_ because their properties are substantially different from those of solids , liquids , and gases . Astrophysical plasmas predominantly contain a mixture of electrons and protons (ionized hydrogen).
Ions can be non-chemically prepared using various ion sources , usually involving high voltage or temperature. These are used in a multitude of devices such as mass spectrometers , optical emission spectrometers , particle accelerators , ion implanters , and ion engines .
As reactive charged particles, they are also used in air purification by disrupting microbes, and in household items such as smoke detectors .
As signalling and metabolism in organisms are controlled by a precise ionic gradient across membranes , the disruption of this gradient contributes to cell death. This is a common mechanism exploited by natural and artificial biocides , including the ion channels gramicidin and amphotericin (a fungicide ).
Inorganic dissolved ions are a component of total dissolved solids , an indicator of water quality in the world.
DETECTION OF IONIZING RADIATION
Schematic of an ion chamber, showing drift of ions. Electrons drift faster than positive ions due to their much smaller mass. Avalanche effect between two electrodes. The original ionization event liberates one electron, and each subsequent collision liberates a further electron, so two electrons emerge from each collision: the ionizing electron and the liberated electron.
The ionizing effect of radiation on a gas is extensively used for the detection of radiation such as alpha , beta , gamma and X-rays . The original ionization event in these instruments results in the formation of an "ion pair"; a positive ion and a free electron, by ion impact by the radiation on the gas molecules. The ionization chamber is the simplest of these detectors, and collects all the charges created by _direct ionization_ within the gas through the application of an electric field.
The Geiger–Müller tube and the proportional counter both use a phenomenon known as a Townsend avalanche to multiply the effect of the original ionizing event by means of a cascade effect whereby the free electrons are given sufficient energy by the electric field to release further electrons by ion impact.
Denoting The Charged State
Equivalent notations for an iron atom (Fe) that lost two electrons, referred to as ferrous .
When writing the chemical formula for an ion, its net charge is written in superscript immediately after the chemical structure for the molecule/atom. The net charge is written with the magnitude _before_ the sign; that is, a doubly charged cation is indicated as 2+ instead of +2. However, the magnitude of the charge is omitted for singly charged molecules/atoms; for example, the sodium cation is indicated as Na+ and _not_ Na1+.
An alternative (and acceptable) way of showing a molecule/atom with multiple charges is by drawing out the signs multiple times; this is often seen with transition metals. Chemists sometimes circle the sign; this is merely ornamental and does not alter the chemical meaning. All three representations of Fe2+ shown in the figure are, thus, equivalent. 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.
Monatomic ions are sometimes also denoted with Roman numerals; for example, the Fe2+ example seen above is occasionally referred to as Fe(II) or FeII. The Roman numeral designates the _formal oxidation state _ of an element, whereas the superscripted numerals denote the net charge. The two notations are, therefore, exchangeable for monatomic ions, but the Roman numerals _cannot_ be applied to polyatomic ions. However, it is possible to mix the notations for the individual metal centre with a polyatomic complex, as shown by the uranyl ion example.
If an ion contains unpaired electrons , it is called a _radical _ ion. Just like uncharged radicals, radical ions are very reactive. Polyatomic ions containing oxygen, such as carbonate and sulfate, are called _oxyanions _. Molecular ions that contain at least one carbon to hydrogen bond are called _organic ions_. If the charge in an organic ion is formally centred on a carbon, it is termed a _carbocation _ (if positively charged) or _carbanion _ (if negatively charged).
Formation Of Monatomic Ions
Monatomic ions are formed by the gain or loss of electrons to the valence shell (the outer-most electron shell) in an atom. The inner shells of an atom are filled with electrons that are tightly bound to the positively charged atomic nucleus , and so do not participate in this kind of chemical interaction. The process of gaining or losing electrons from a neutral atom or molecule is called _ionization_.
Atoms can be ionized by bombardment with radiation , but the more usual process of ionization encountered in chemistry is the transfer of electrons between atoms or molecules. This transfer is usually driven by the attaining of stable ("closed shell") electronic configurations. Atoms will gain or lose electrons depending on which action takes the least energy.
For example, a sodium atom, Na, has a single electron in its valence shell, surrounding 2 stable, filled inner shells of 2 and 8 electrons. Since these filled shells are very stable, a sodium atom tends to lose its extra electron and attain this stable configuration, becoming a sodium cation in the process Na → Na+ + e−
On the other hand, a chlorine atom, Cl, has 7 electrons in its valence shell, which is one short of the stable, filled shell with 8 electrons. Thus, a chlorine atom tends to _gain_ an extra electron and attain a stable 8-electron configuration, becoming a chloride anion in the process: Cl + e− → Cl−
This driving force is what causes sodium and chlorine to undergo a chemical reaction, wherein the "extra" electron is transferred from sodium to chlorine, forming sodium cations and chloride anions. Being oppositely charged, these cations and anions form ionic bonds and combine to form sodium chloride , NaCl, more commonly known as table salt. Na+ + Cl− → NaCl
Formation Of Polyatomic And Molecular Ions
An electrostatic potential map of the nitrate ion (NO3−). The 3-dimensional shell represents a single arbitrary isopotential .
Polyatomic and molecular ions are often formed by the gaining or losing of elemental ions such as a proton, H+, in neutral molecules. For example, when ammonia , NH3, accepts a proton, H+—a process called protonation —it forms the ammonium ion, NH4+. Ammonia and ammonium have the same number of electrons in essentially the same electronic configuration , but ammonium has an extra proton that gives it a net positive charge.
Ammonia can also lose an electron to gain a positive charge, forming the ion ·NH+ 3. However, this ion is unstable, because it has an incomplete valence shell around the nitrogen atom, making it a very reactive radical ion.
Due to the instability of radical ions, polyatomic and molecular ions are usually formed by gaining or losing elemental ions such as H+ , rather than gaining or losing electrons. This allows the molecule to preserve its stable electronic configuration while acquiring an electrical charge.
Main article: Ionization potential
The energy required to detach an electron in its lowest energy state from an atom or molecule of a gas with less net electric charge is called the _ionization potential_, or _ionization energy_. The _n_th ionization energy of an atom is the energy required to detach its _n_th electron after the first _n − 1_ electrons have already been detached.
Each successive ionization energy is markedly greater than the last. Particularly great increases occur after any given block of atomic orbitals is exhausted of electrons. For this reason, ions tend to form in ways that leave them with full orbital blocks. For example, sodium has one _valence electron _ in its outermost shell, so in ionized form it is commonly found with one lost electron, as Na+ . On the other side of the periodic table, chlorine has seven valence electrons, so in ionized form it is commonly found with one gained electron, as Cl− . Caesium has the lowest measured ionization energy of all the elements and helium has the greatest. In general, the ionization energy of metals is much lower than the ionization energy of nonmetals , which is why, in general, metals will lose electrons to form positively charged ions and nonmetals will gain electrons to form negatively charged ions.
Main article: Ionic bond
_Ionic bonding_ is a kind of chemical bonding that arises from the mutual attraction of oppositely charged ions. Ions of like charge repel each other, and ions of opposite charge attract each other. Therefore, ions do not usually exist on their own, but will bind with ions of opposite charge to form a crystal lattice . The resulting compound is called an _ionic compound_, and is said to be held together by _ionic bonding_. In ionic compounds there arise characteristic distances between ion neighbours from which the spatial extension and the ionic radius of individual ions may be derived.
The most common type of ionic bonding is seen in compounds of metals and nonmetals (except noble gases , which rarely form chemical compounds). Metals are characterized by having a small number of electrons in excess of a stable, closed-shell electronic configuration. As such, they have the tendency to lose these extra electrons in order to attain a stable configuration. This property is known as _electropositivity _. Non-metals, on the other hand, are characterized by having an electron configuration just a few electrons short of a stable configuration. As such, they have the tendency to gain more electrons in order to achieve a stable configuration. This tendency is known as _electronegativity _. When a highly electropositive metal is combined with a highly electronegative nonmetal, the extra electrons from the metal atoms are transferred to the electron-deficient nonmetal atoms. This reaction produces metal cations and nonmetal anions, which are attracted to each other to form a _salt _.
Common cations COMMON NAME FORMULA HISTORIC NAME
Copper(I) Cu+ cuprous
Copper(II) Cu2+ cupric
Iron(II) Fe2+ ferrous
Iron(III) Fe3+ ferric
Lead(II) Pb2+ plumbous
Lead(IV) Pb4+ plumbic
Mercury(II) Hg2+ mercuric
Potassium K+ kalic
Silver Ag+ argentous
Sodium Na+ natric
Tin(II) Sn2+ stannous
Tin(IV) Sn4+ stannic
Ammonium NH+ 4
Mercury(I) Hg2+ 2 mercurous
Common anions FORMAL NAME FORMULA ALT. NAME
Azide N− 3
Carbonate CO2− 3
Chlorate ClO− 3
Chromate CrO2− 4
Dichromate Cr 2O2− 7
Dihydrogen phosphate H 2PO− 4
Hydrogen carbonate HCO− 3 bicarbonate
Hydrogen sulfate HSO− 4 bisulfate
Hydrogen sulfite HSO− 3 bisulfite
Monohydrogen phosphate HPO2− 4
Nitrate NO− 3
Nitrite NO− 2
Perchlorate ClO− 4
Permanganate MnO− 4
Peroxide O2− 2
Phosphate PO3− 4
Sulfate SO2− 4
Sulfite SO2− 3
Superoxide O− 2
Thiosulfate S 2O2− 3
Silicate SiO4− 4
Metasilicate SiO2− 3
Aluminium silicate AlSiO− 4
_ANIONS FROM ORGANIC ACIDS_
Acetate CH 3COO− ethanoate
Formate HCOO− methanoate
Oxalate C 2O2− 4 ethanedioate
* Air ionizer * Auroras * Gaseous ionization detectors * Ion beam * Ion exchange * Ionizing radiation * List of ions * List of plasma physics articles * List of oxidation states of the elements * Stopping power of radiation particles * Ioliomics
* ^ "Ion" entry in _ Collins English Dictionary _, HarperCollins Publishers, 1998. * ^ _A_ _B_ _C_ Knoll, Glenn F (1999). _ Radiation detection and measurement_ (3rd ed.). New York: Wiley. ISBN 0-471-07338-5 . * ^ _ Michael Faraday (1791-1867)_. UK: BBC. * ^ "Online etymology dictionary". Retrieved 2011-01-07. * ^ https://www.nobelprize.org/nobel_prizes/chemistry/laureates/1903/index.html * ^ Harris, William; Levey, Judith, eds. (1975). _The New Columbia Encyclopedia_ (4th ed.). New York City: Columbia University. p. 155. ISBN 0-231035-721 . * ^ McHenry, Charles, ed. (1992). _The New Encyclopædia Britannica_. 1 (15 ed.). Chicago: Encyclopædia Britannica, Inc. p. 587. ISBN 085-229553-7 . * ^ Cillispie, Charles, ed. (1970). _Dictionary of Scientific Biography_ (1 ed.). New York City: Charles Scribner's Sons. pp. 296–302. ISBN 0-684101-122 . * ^ _ Oxford University Press _ (2013). "Oxford Reference: OVERVIEW anion". oxfordreference.com. * ^ _ University of Colorado Boulder _ (November 21, 2013). "Atoms and Elements, Isotopes and Ions". colorado.edu. * ^ _ Oxford University Press _ (2013). "Oxford Reference: OVERVIEW cation". oxfordreference.com. * ^ Douglas W. Haywick, Ph.D.; University of South Alabama (2007–2008). "Elemental Chemistry" (PDF). usouthal.edu. * ^ _ Purdue University _ (November 21, 2013). "Amino Acids". purdue.edu. * ^ Frank Press ;background:none transparent;border:none;-moz-box-shadow:none;-webkit-box-shadow:none;box-shadow:none;">v
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