Particle, atom or molecule with a net electrical charge
For other uses, see Ion (disambiguation).
Electron transfer between lithium (Li) and fluorine (F). Forming an ionic bond, Li and F become Li+ and F− ions.
An ion (/ˈaɪ.ɒn,-ən/)[1] 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[2] while an anion is a negatively charged ion with more electrons than protons.[3] 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.[4] 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.
^"ion". CollinsDictionary.com. HarperCollins. Archived 2013-12-24 at the Wayback Machine.
^"cation". Merriam-Webster.com Dictionary. Retrieved 2021-10-06. Archived 2021-10-06 at the Wayback Machine.
^"anion". Merriam-Webster.com Dictionary. Retrieved 2021-10-06. Archived 2021-10-06 at the Wayback Machine.
^Knoll, Glenn F. (1999). Radiation Detection and Measurement (3rd ed.). New York: Wiley. ISBN 978-0-471-07338-3.
An ion (/ˈaɪ.ɒn, -ən/) is an atom or molecule with a net electrical charge. The charge of an electron is considered to be negative by convention and this...
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Ion exchange is a reversible interchange of one species of ion present in an insoluble solid with another of like charge present in a solution surrounding...
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a catalyst. The hydroxide ion forms salts, some of which dissociate in aqueous solution, liberating solvated hydroxide ions. Sodium hydroxide is a multi-million-ton...
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A nitrenium ion (also called: aminylium ion or imidonium ion (obsolete)) in organic chemistry is a reactive intermediate based on nitrogen with both an...
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