The delocalization of pi electrons must result in a lowering of the electronic energy. Unhybridized p orbitals must overlap to form a continuous ring of or parallel orbits, usually requiring a planar 
The delocalization of pi electrons must result in a lowering of the electronic energy. Unhybridized p orbitals must overlap to form a continuous ring of or parallel orbits, usually requiring a planar structure. Each atom in a ring must have an unhybridized p orbital. Finally, the structure itself must be cyclic. When these four conditions are met, this rule comes into effect. It states that a cyclic molecule with 4N pi electrons does not contain the property in question, while a molecule with 4N+2 pi electrons does contain the property. FTP, identify this rule used to determine if a molecule is aromatic.
The delocalization of pi electrons must result in a lowering of the electronic energy.
{Hückel’s} rule (accept {aromaticity} or equivalents before “this rule”)