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Why doesn't carbon form bonds with itself to form a molecule? Carbon shows the property of catenation, so why doesn't it form a cyclic molecule such as:

 C = C 
 ‖   ‖ 
 C = C 
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    $\begingroup$ graphene, diamond, fullerenes ... $\endgroup$
    – gilleain
    Nov 15 '18 at 9:23
  • $\begingroup$ also relevant : chemistry.stackexchange.com/questions/43887/… $\endgroup$
    – gilleain
    Nov 15 '18 at 11:58
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    $\begingroup$ buckyball also... $\endgroup$
    – MaxW
    Nov 15 '18 at 20:55
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    $\begingroup$ Diamond and graphene if not engineered down do not qualify as molecules. Buckyballs is a nik for Buckminsterfullerenes. See Oscar Lanzi below for an answer $\endgroup$
    – Alchimista
    Nov 17 '18 at 17:43
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They do form. Besides fullerenes, there are carbon molecules with varying numbers of atoms around some stars. Such molecular forms are, of course, less stable than the macromolecular structures we more commonly see under ambient conditions.

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