Benzene is a ring of 6 carbon atoms joined into a hexagonal shape with a hydrogen bonded to each. It is one of the most fundamental structures in organic chemistry and can be found in most organic molecules. The presence of a benzene ring makes a molecule aromatic. Pendant size: 0.5" x 0.5" (1.5 cm x 1.5 cm). Necklace length: 18"  (46 cm).