A sigma bond is formed from the head-to-head overlap of two atomic orbitals. Therefore, the shared molecular orbital lies directly between the nuclei of the bonding atoms.
A pi bond is formed by the side-to-side overlap of two atomic orbitals. The shared molecular orbital therefore exists above and below the imaginary line between the atoms, but not directly between the atoms.
A single covalent bond is always a sigma bond. A double bond is one sigma bond and one pi bond, while a triple bond is one sigma bond and two pi bonds.
A pi bond is formed by the side-to-side overlap of two atomic orbitals. The shared molecular orbital therefore exists above and below the imaginary line between the atoms, but not directly between the atoms.
A single covalent bond is always a sigma bond. A double bond is one sigma bond and one pi bond, while a triple bond is one sigma bond and two pi bonds.
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