The term aromaticity was initially introduced to describe the properties of molecules with special aromatic odor, such as benzene, and now is considered as one of the most important concepts in chemistry. It is widely used to account for the unusual stability of aromatic compounds arising from delocalization of electrons. Aromaticity can be assessed by various aromatic criteria, such as the Hückel 4n+2 rule, spherical 2(n+1)2 rule, nuclear independent chemical shifts (NICS), and ring currents.
Click here for original story, A 2D superatomic-molecule theory to unify the aromaticity rule of π-conjugated systems
Source: Phys.org