"Carbon (from Latin: carbo "coal") is a chemical element with the symbol C and atomic number 6. It is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds. It belongs to group 14 of the periodic table.[13] Three isotopes occur naturally, 12C and 13C being stable, while 14C is a radionuclide, decaying with a half-life of about 5,730 years.[14] Carbon is one of the few elements known since antiquity.[15]
Carbon is the 15th most abundant element in the Earth´s crust, and the fourth most abundant element in the universe by mass after hydrogen, helium, and oxygen. Carbon´s abundance, its unique diversity of organic compounds, and its unusual ability to form polymers at the temperatures commonly encountered on Earth enables this element to serve as a common element of all known life. It is the second most abundant element in the human body by mass (about 18.5%) after oxygen.[16]" - (en.wikipedia.org 07.03.2020)
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