Carbon used carbon dating
It is the second most abundant element in the human body by mass (about 18.5%) after oxygen.
The physical properties of carbon vary widely with the allotropic form.
"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.
Take the extinction of Neanderthals, which occurred in western Europe less than 30,000 years ago.
It belongs to group 14 of periodic table 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.
As a rule, carbon dates are younger than calendar dates: a bone carbon-dated to 10,000 years is around 11,000 years old, and 20,000 carbon years roughly equates to 24,000 calendar years.
The problem, says Bronk Ramsey, is that tree rings provide a direct record that only goes as far back as about 14,000 years.
“If you have a better estimate of when the last Neanderthals lived to compare to climate records in Greenland or elsewhere, then you’ll have a better idea of whether the extinction was climate driven or competition with modern humans,” says Paula Reimer, a geochronologist at Queen’s University in Belfast, UK.