Sigma and Pi Bonds
Sigma bond (s bond) is a bond formed by the overlap of orbitals in an end-to-end fashion, with the electron density concentrated between the nuclei of the bonding atoms.
A pi bond (p bond) is a bond formed by the overlap of orbitals in a side-by-side fashion with the electron density concentrated above and below the plane of the nuclei of the bonding atoms.
By and large, single bonds between molecules are dependably sigma bonds. Twofold bonds are involved one sigma and one pi bond. Triple bonds are comprised of one sigma bond and two pi bonds
Sigma bonds form between two atoms.
Pi bonds form from p orbital overlap.
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