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A Pi-bond is a type of covalent bond that is composed of the sideways overlap of two neighbouring P orbitals[1]. P orbitals have a dumb-bell shape and when they overlap to form a Pi-bond the structure consists of one P orbital above the molecular axis and one P orbital below the molecular axis. The Pi-bond is formed from unbound P-orbitals from neighbouring atoms. The Pi- bond is arranged from an unbound electron in the P-orbital of one atom bonding to an unbound electron in the P-orbital of another atom causing the P-orbitals to overlap sideways to form the Pi-bond. A single bond is built up of one sigma bond and no Pi-bonds whereas a double bond is build up of a sigma bond and a Pi-bond[2][3].

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  1. Chegg Study, Sigma and Pi Bonds https://www.chegg.com/homework-help/definitions/sigma-and-pi-bonds-6
  2. Helmenstine, Anne Marie, Ph.D. "Pi Bond Definition in Chemistry." ThoughtCo, Dec. 5, 2018, thoughtco.com/definition-of-pi-bond-605519.
  3. http://www.chem.ucla.edu/~harding/IGOC/P/pi_bond.html
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