Wikipedia carbon 14 dating

"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. 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.The physical properties of carbon vary widely with the allotropic form.For example, graphite is opaque and black while diamond is highly transparent.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.They are chemically resistant and require high temperature to react even with oxygen.

Once the organism dies, however, it ceases to absorb carbon-14, so that the amount of the radiocarbon in its tissues steadily decreases.It bonds readily with other small atoms, including other carbon atoms, and is capable of forming multiple stable covalent bonds with suitable multivalent atoms.Carbon is known to form almost ten million different compounds, a large majority of all chemical compounds.Graphite is much more reactive than diamond at standard conditions, despite being more thermodynamically stable, as its delocalised pi system is much more vulnerable to attack.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).The largest sources of inorganic carbon are limestones, dolomites and carbon dioxide, but significant quantities occur in organic deposits of coal, peat, oil, and methane clathrates.

You must have an account to comment. Please register or login here!