An ion is an atom, group of atoms, or subatomic particle with a net electric charge. The simplest ions are the electron (single negative charge, e⁻), proton (a hydrogen ion, H⁺, positive charge), and alpha particle (helium ion, He²⁺, consisting of two protons and two neutrons) . A negatively charged ion, which has more electrons in its electron shells than it has protons in its nuclei, is known as an anion, for it is attracted to anodes; a positively-charged ion, which has fewer electrons than protons, is known as a cation (pronounced cat-eye-on), for it is attracted to cathodes. An ion with a single atom is called a monatomic ion, and an ion with more than one is called a polyatomic ion. Larger ions containing many atoms are called molecular ions. The process of converting into ions and the state of being ionized is called ionization. The recombining of ions and electrons to form neutral atoms is called recombination. A polyatomic anion that contains oxygen is sometimes known as an oxyanion.

Atomic and polyatomic ions are denoted by a superscript with the sign of the net electric charge and the number of electrons lost or gained, if more than one. For example: H⁺, SO₄²⁻.

A collection of non-aqueous gas-like ions, or even a gas containing a proportion of charged particles, is called a plasma, often called the fourth state of matter because its properties are quite different from solids, liquids, and gases. Astrophysical plasmas containing predominently a mixture of electrons and protons, may make up as much as 99.9% of the visible universe ^*. The positively charged proton is about 1836 times more massive than the negatively charged electron.

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@JKenayP hmph. Ion wana hear that!
Cocodome (Evi Aki) Sun, 20 Dec 2009 21:59:54 -0000
@JKenayP hmph. Ion wana hear that!
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SKYECHANDLER (SKYE CHANDLER) Sun, 20 Dec 2009 21:59:16 -0000
@FLAWLESS_1_1_79 lmao....ion kno y i always go 2 ur page 2 c ur bg pic...i like it
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cartier85 (cb barber) Sun, 20 Dec 2009 21:58:30 -0000
my niggga just called me he told a nigga ill beat him 8 outta 10 times... for 200... ion no if I like a nigga to loose 8 of 10 to me lol
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