Wikipedia carbon dating
For example, graphite can be oxidised by hot concentrated nitric acid at standard conditions to mellitic acid, C Carbon sublimes in a carbon arc which has a temperature of about 5,800 K (5,530 °C; 9,980 °F).Thus, irrespective of its allotropic form, carbon remains solid at higher temperatures than the highest melting point metals such as tungsten or rhenium."coal") is a chemical element with symbol C and atomic number 6.It is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds.Although thermodynamically prone to oxidation, carbon resists oxidation more effectively than elements such as iron and copper that are weaker reducing agents at room temperature.Carbon is the sixth element, with a ground-state electron configuration of 1s, of which the four outer electrons are valence electrons.
They are chemically resistant and require high temperature to react even with oxygen.Carbon's covalent radii are normally taken as 77.2 pm (C–C), 66.7 pm (C=C) and 60.3 pm (C≡C), although these may vary depending on coordination number and what the carbon is bonded to.In general, covalent radius decreases with lower coordination number and higher bond order.Graphite is a good electrical conductor while diamond has a low electrical conductivity.Under normal conditions, diamond, carbon nanotubes, and graphene have the highest thermal conductivities of all known materials.
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The system of carbon allotropes spans a range of extremes: Atomic carbon is a very short-lived species and, therefore, carbon is stabilized in various multi-atomic structures with different molecular configurations called allotropes.