(Polar molecules, Non-polar molecules, etc.)
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Sigma bonds are made up of two orbitals in which 1 electron from each atom interact end to end. This is an s-s orbital overlap and allows for rotation. A pi bond is made up of a side by side overlap of orbitals and prevents rotation.
A sigma bond is the strongest type of covalent chemical bond. A pi bond contains p-p orbitals and it is a covalent bond formed by the side to side overlap of orbitals, which can be easily broken. Also, a single bond consists of a sigma bond, and let's say you have a double bond, this consists of a sigma bond and a pi bond.
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