Aromaticity is a property of certain cyclic (ring-shaped), planar (flat), and conjugated (alternating single and multiple bonds) hydrocarbons and other compounds that results in increased stability compared to non-aromatic compounds.
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Aromaticity describes the distinctive stability and associated electronic properties of suitable cyclic delocalized systems. In simple planar conjugated rings, orbital occupancy determines whether delocalization is stabilizing; merely drawing a ring is insufficient.