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I have three naturally occurring isotopes: carbon-12 constitutes 98.89 percent of all carbon atoms and serves as the standard for the atomic mass scale; carbon-13 is the only magnetic isotope, which makes it very important for structural studies of compounds containing carbon. Carbon-14 is produced by cosmic ray bombardment of nitrogen. It is radioactive with a half-life of 5,760 years. The amount of carbon-14 remaining in historical artifacts can be used to estimate their age.
4 valence electrons
| My Properties state: solid * Melting Point : 3820 K |
* Boiling Point : 5100 K
* Density [298K] : 3513 kg m-3
* atomic radius: 77.2pm
* atomic number: 6
* atomic mass: 12.0107 Amu
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I am a carbon!
I am very useful when you want to know how old is something that contains me!
you can calculate the age using my halflife!
You might be very familiar to me because I am also used as a pecnil graphite!!
Sometimes I am very beautiful and sometimes I am black and dark! many girls love me when I am become a diamond. I can also be a pink diamond,
I am very strong, so people use me as a cutter ! I can cut most things! haha~
carbon oxide(carbon suboxide)
Carbon is of prehistoric knowledge as diamond as well as graphite. That diamonds were known at least as early as 1200 B.C. seems probable according to ancient Hindu writings. The earliest authentic reference to the diamond is ascribed to one Manilius near the First Century of our era. The name diamond derives from a corruption of the Greek word adamas "the invincible". The first recognition of graphite is obscured in antiquity. It was confused with other minerals of similar appearance, chiefly molydenite (MoS2). One name for graphite is plumbago, like lead; and until modern times it was thought to contain lead. Scheele, in 1779, demonstrated that graphite oxidized to carbon dioxide providing its chemical constitution. The name graphite, which comes from the Greek verb graphain, "to write", originated with Werner in 1789. Carbon as a reduction agent in the making of iron and other metals is also of prehistoric origin. Not until modern times, however, was the identity and role of carbon in such processes established and completely understood.
Diamond, Pencils graphite
Nuclear Plant Control
isolation of carbon.
Carbon is available in nature as graphite and (to a much lesser extent!) as diamond. Artificial graphite is made by the reaction of coke with silica (SiO2).
SiO2 + 3C (2500°C) → "SiC" → Si (g) + C(graphite)
Artificial diamonds are made by the application of heat and pressure (> 125 kBar) in the presence of a catalyst such as iron, chromium or platinum. It seems that the metal melts on the carbon surface, the graphite dissolves in the metal film, and the less soluble diamond precipitates out.
Latest page update: made by GraceLim
, Oct 22 2006, 5:06 PM EDT
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Keyword tags: carbon elements diamond
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