This indicates that the pi electrons are localized and therefore not considered to be aromatic.

This allows the "pi" electrons to delocalize over large areas.

This turns out to be equivalent to the 4n+2 rule, where n is the number of pi electrons.

The positive charge is delocalized between the amino groups over 4 bonds involving 6 pi electrons.

They are most of the time characterized by delocalized pi electrons.

Many dyes (colored molecules) are characterized by these delocalized pi electrons and their color.

The addition of acid or base disrupts the delocalized pi electrons.

They allow a delocalization of pi electrons across all the adjacent aligned p-orbitals.

The pi electrons do not belong to a single bond or atom, but rather to a group of atoms.

The macrocycle has 26 pi electrons in total.