Benzene has a planar ring of six carbon chemical atoms, each bearing one hydrogen. Its electron density is distributed over the ring; the alternating covalent bonds in one resonance structure do not describe alternating actual bond lengths. [ref]

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Benzene by Ciro Santilli 40 Created 2024-07-04 Updated 2026-08-21
Video 1.
The FASCINATING 200-Year History of Benzene by Chemistorian
. Source. Interesting history. Notably how things were only finally well settled by X-ray crystallography.