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| | Encyclopedia article on Carbon [EncycloZine] (Site not responding. Last check: 2007-10-20) |
 | | Carbon has two stable, naturally-occurring isotopes: Carbon-12, or C-12, (98.89%) and Carbon-13, or C-13, (1.11%), and one unstable, naturally-occurring, radioisotope, Carbon-14 or C-14. |
 | | Carbon-14 has a half-life of 5715 years and has been used extensively for radiocarbon dating wood, archaeological sites and specimens. |
 | | Carbon monoxide (CO), which is present in the exhaust of combustion engines, and cyanide (CN), which is sometimes in mining pollution, are extremely toxic to mammals. |
| encyclozine.com /Carbon (1744 words) |
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