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pi bond

in chemistry, a cohesive interaction between two atoms and a pair of electrons that occupy an orbital located in two regions roughly parallel to the line determined by the two atoms. A pair of atoms may be connected by one or by two pi bonds only if a sigma bond also exists between them; in the molecule of nitrogen (N2), for example, the triple bond between the two nitrogen atoms comprises a sigma bond and two pi bonds.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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