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Carbon is a chemical element with symbol C and atomic number 6. On the periodic table, it is the first of six elements in column 14, which have in common the composition of their outer electron shell. It is nonmetallic and tetravalent?making four electrons available to form covalent chemical bonds. Three isotopes occur naturally, 12C and 13C being stable while 14C is radioactive, decaying with a half-life of about 5,730 years. Carbon is one of the few elements known since antiquity.