From HomoExcelsior

A naturally abundant nonmetallic element that occurs in many inorganic and in all organic compounds, exists freely as graphite and diamond and as a constituent of coal, limestone, and petroleum, and is capable of chemical self-bonding to form an enormous number of chemically, biologically, and commercially important molecules.

• Atomic number 6
• Atomic weight 12.01115
• Sublimation point above 3,500C
• Boiling point 4,827C
• Specific gravity
  1. Amorphous carbon 1.8 to 2.1
  2. Diamond 3.15 to 3.53
  3. Graphite 1.9 to 2.3
• Valence 2, 3, 4

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