Carbon: symbol C, atomic number 6; member of group 14 on periodic table; nonmetallic, tetravalent: makes 4 electrons available to form covalent chemical bonds; 3 naturally occurring isotopes with 12 C 13 C stable & 14 C radioactive (half-life 5730 yrs); several allotropes: best known: graphite, diamond, amorphous carbon; physical properties vary widely; all are solids under normal conditions; 15th most abundant element in crust; 4th most abundant in universe
Colonial Mills 8-In X 28-In Midnight Carbon Olefin/Polypropylene Indoor Stair Tread Mat (Set Of 13) Mn47a008x028
Radiolabeled Compounds in Diagnostic Medicine Isotopes are atoms of the same element that differ from each other only in the number of neutrons. For example, carbon has three isotopes that are found in nature: 12C (called carbon 12), 13C (called carbon 13), and 14C (called carbon 14). Each of these isotopes has six protons and six...
Conformational and configurational studies on 3-azabicyclo[3.3.1]nonane (3-abn) derivatives and related systems employing carbon-13 NMR spectroscopy - Jeyaraman - 1982 - Journal of Heterocyclic Chemistry - Wiley Online Library