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In organic chemistry sigma bonds (Ï) are always the first bond between two atoms, resulting from overlap along the bonding axis (of hybrid orbitals), while pi bonds (Ï) are second and third bonds resulting from the overlap of p orbitals, above and below (or in front and back of) the bonding axis.
By Anne Marie Helmenstine, Ph.D. Definition: Sigma bonds are covalent bonds formed by direct overlapping between two adjacent atom's outermost orbitals. The single electrons from each atom's orbital combine to form an electron pair creating the sigma bond. Sigma bonds are generally denoted by the Greek letter Ï.