Diatomic carbon

Diatomic carbon
Names
	IUPAC name Diatomic carbon
	Systematic IUPAC name Ethenediylidene (substitutive); Dicarbon(C—C) (additive)
Identifiers
CAS Number	12070-15-4 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:30083;
ChemSpider	122807 ;
Gmelin Reference	196
PubChem CID	139247;
CompTox Dashboard (EPA)	DTXSID101027115 ;
	InChI InChI=1S/C2/c1-2 Key: LBVWYGNGGJURHQ-UHFFFAOYSA-N ;
	SMILES [C]=[C];
Properties
Chemical formula	C2
Molar mass	24.022 g·mol−1
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Diatomic carbon (systematically named dicarbon and 1λ²,2λ²-ethene), is a green, gaseous inorganic chemical with the chemical formula C=C (also written [C₂] or C₂). It is kinetically unstable at ambient temperature and pressure, being removed through autopolymerisation. It occurs in carbon vapor, for example in electric arcs; in comets, stellar atmospheres, and the interstellar medium; and in blue hydrocarbon flames. Diatomic carbon is the second simplest of the allotropes of carbon (after atomic carbon), and is an intermediate participant in the genesis of fullerenes.