Cation - Definition. Was ist Cation
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Was (wer) ist Cation - definition

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
  • 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.
  • Schematic of an ion chamber, showing drift of ions. Electrons drift faster than positive ions due to their much smaller mass.<ref name = "knoll"/>
  • −}} ions.
  • [[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]].
  • 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]].

Cation         
·noun An electro-positive substance, which in electro-decomposition is evolved at the cathode;
- opposed to anion.
cation         
['kat???n]
¦ noun Chemistry a positively charged ion. The opposite of anion.
Derivatives
cationic kat??'?n?k adjective
Origin
C19: from cata- or from cathode, + ion.
Cation–pi interaction         
  • Fig. 1: Examples of π-π. CH-π, and π-cation interactions
  • Fig. 2: The Stoddart synthesis of [2]catenane
  • 275px
  • Cationic [[Acetylcholine]] binding to a [[tryptophan]] residue of the nicotinamide acetylcholine receptor via a cation–π effect.
  • quadrupole]] charge distribution.
  • Binding energy (in kcal/mol) for Na<sup>+</sup> to benzene with prototypical substituents.<ref name="electrostaticmodel" />
  • 450px
  • Cyclophane host–guest complex
  • 450px
  • Cation–π interaction in indole-3-acetic acid choline ester compared to neutral analog
  • 450px
  • Quadrupole moments of benzene and hexafluorobenzene. The polarity is inverted due to differences in electronegativity for hydrogen and fluorine relative to carbon; the inverted quadrupole moment of hexafluorobenzene is necessary for anion-pi interactions.
  • 350px
  • Calculated interaction energies of methylamonium and benzene in a variety of solvents
  • Cyclization of squalene to form hopene
NONCOVALENT MOLECULAR INTERACTION BETWEEN THE FACE OF AN ELECTRON-RICH Π SYSTEM AND AN ADJACENT CATION; EXAMPLE OF NONCOVALENT BONDING BETWEEN A MONOPOLE (CATION) AND A QUADRUPOLE (Π SYSTEM)
Cation-pi interaction; Anion-pi interaction; Anion–pi interaction; Cation-π interaction; Cation–pi interaction
Cation–π interaction is a noncovalent molecular interaction between the face of an electron-rich π system (e.g.

Wikipedia

Ion

An ion () is an atom or molecule with a net electrical charge. The charge of an electron is considered to be negative by convention and this charge is equal and opposite to the charge of a proton, which is considered to be positive by convention. The net charge of an ion is not zero because its total number of electrons is unequal to its total number of protons.

A cation is a positively charged ion with fewer electrons than protons while an anion is a negatively charged ion with more electrons than protons. Opposite electric charges are pulled towards one another by electrostatic force, so cations and anions attract each other and readily form ionic compounds.

Ions consisting of only a single atom are termed atomic or monatomic ions, while two or more atoms form molecular ions or polyatomic ions. In the case of physical ionization in a fluid (gas or liquid), "ion pairs" are created by spontaneous molecule collisions, where each generated pair consists of a free electron and a positive ion. Ions are also created by chemical interactions, such as the dissolution of a salt in liquids, or by other means, such as passing a direct current through a conducting solution, dissolving an anode via ionization.

Beispiele aus Textkorpus für Cation
1. But more significant are his remarks on the Gilligan affair, which appear to contradict the unreserved apology for the BBCs errors which Lord Ryder of Wensum, the acting chairman of the governors, made to the Government after publi– cation of the Hutton report.