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There are several different fullerenes, the most widely known being the “buckeyball” C60. Little is known about the fullerenes and they are a current subject of research.[25] There is also amorphous carbon, which is carbon without any crystalline structure.[26] In mineralogy, the term is used to refer to soot and coal, although these are not truly amorphous as they contain small amounts of graphite or diamond.[27][28] Carbon’s most common isotope at 98.9% is 12C, with six protons and six neutrons.[29] 13C is also stable, with six protons and seven neutrons, at 1.1%.[29] Trace amounts of 14C also occur naturally but this isotope is radioactive and decays with a half life of 5730 years; it is used for radiocarbon dating.[30] Other isotopes of carbon have also been synthesised. Carbon forms covalent bonds with other non metals with an oxidation state of 4, 2, +2 or +4.[25].

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