Carbon: Data tables and historic information.
Carbon: The properties of the many forms of carbon and their importance in life, fuels and emissions.
ChemGlobe: Carbon: Electronic, thermal, and steric data along with basic information.
ChemicalElements.com: Carbon: Basic information, atomic structure, and table of isotopes.
EnvironmentalChemistry.com: Carbon: Atomic structure, chemical and physical properties, and table of nuclides.
It's Elemental: Carbon: Basic physical and historical information.
LANL: Carbon: History, forms, compounds, and isotopes.
Lenntech: Carbon: Physical data, chemical properties, and health effects.
Symbol C: A resource for information on the carbon element - useful for school-related projects.
The Chemistry of Carbon: Diagrams and VRML models of the element.
Visual Elements: Carbon: Image, animation, source, general information, and key isotopes.
WebElements: Carbon: Extensive information on history, uses, occurrence, compounds, and properties of the element.
Wikipedia: Carbon: Properties of the element, including its history, applications, and characteristics.