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|Section2= }} Diatomic carbon (systematically named ethenediylidene and dicarbon(''C''—''C'')), also called dicarbon, is an inorganic chemical with the chemical formula C=C (also written or ). It is a gas that only exists above ), below which it aggregates into graphite or fullerenes. It occurs in carbon vapor, for example in electric arcs; in comets, stellar atmospheres and the interstellar medium; and in blue hydrocarbon flames. == Nomenclature == ''Dicarbon'' is the preferred IUPAC name. The systematic names ''ethenediylidene'' and ''dicarbon(C—C)'', valid IUPAC names, are constructed according to the substitutive and additive nomenclatures, respectively. ''Ethenediylidene'' is viewed as ethylene with four hydrogen atoms removed. By default, this name pays no regard to the electronic state of the diatomic carbon. When the electronic state is considered, the states with no unpaired electrons are named ethenediylidene, whereas the states with two unpaired electrons are named ethenediyldiylidene, and the states with four unpaired electrons are named ethenetetrayl. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Diatomic carbon」の詳細全文を読む スポンサード リンク
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