Carbon dating used determine age earth

08 Apr

In general, covalent radius decreases with lower coordination number and higher bond order.

Carbon compounds form the basis of all known life on Earth, and the carbon-nitrogen cycle provides some of the energy produced by the Sun and other stars.

"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.

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Carbon forms a vast number of compounds, more than any other element, with almost ten million compounds described to date, The allotropes of carbon include graphite, one of the softest known substances, and diamond, the hardest naturally occurring substance.The three relatively well-known allotropes of carbon are amorphous carbon, graphite, and diamond.Once considered exotic, fullerenes are nowadays commonly synthesized and used in research; they include buckyballs, The amorphous form is an assortment of carbon atoms in a non-crystalline, irregular, glassy state, not held in a crystalline macrostructure.The physical properties of carbon vary widely with the allotropic form.For example, graphite is opaque and black while diamond is highly transparent.