In chemistry, pi bonds (π bonds) are covalent chemical bonds where two lobes of an orbital on one atom overlap two lobes of an orbital on another atom. The atomic orbital combinations can be px-px or py-py. An unbound p-orbital electron in one atom forms an electron pair with a neighboring atoms unbound, parallel p-orbital electron. This electron pair forms the pi bond. Similar to the sigma bonding, a pi bond can be bonding or antibonding. Pi bonds are more diffuse bonds than the sigma bonds. Electrons in pi bonds are sometimes referred to as pi electrons.
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