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Ion Sign Video

Upload On Tue Aug 21 2012 by ASL STEM

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Definition

An electrically charged atom, molecule, or group of atoms or molecules. A negative ion (or anion) contains more electrons than are necessary for the atom or group to be neutral, a positive ion (or cation) contains less.

Source: The Penguin Dictionary of Physics. London: Penguin, 2009. Credo Reference. Web. 17 August 2012.