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Carbon

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This article is about the chemical element. For other uses, see Carbon (disambiguation).
"Element 6" redirects here. For the company, see Element Six.
Not to be confused with Cabrón.

Carbon, 6C
Graphite (left) and diamond (right), two allotropes of carbon
Carbon
Allotropesgraphite, diamond and more (see Allotropes of carbon)
Appearance
  • graphite: black, metallic-looking
  • diamond: clear
Standard atomic weight Ar°(C)
Carbon in the periodic table
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson
–
↑
C
↓
Si
boron ← carbon → nitrogen
Atomic number (Z)6
Groupgroup 14 (carbon group)
Periodperiod 2
Block  p-block
Electron configuration[He] 2s2 2p2
Electrons per shell2, 4
Physical properties
Phase at STPsolid
Sublimation point3915 K ​(3642 °C, ​6588 °F)
Density (near r.t.)graphite: 2.266 g/cm3[3][4]
diamond: 3.515 g/cm3
amorphous: 1.8–2.1 g/cm3
Triple point4600 K, ​10,800 kPa[5][6]
Heat of fusiongraphite: 117 kJ/mol
Molar heat capacitygraphite: 8.517 J/(mol·K)
diamond: 6.155 J/(mol·K)
Atomic properties
Oxidation states−4, −3, −2, −1, 0, +1,[7] +2, +3,[8] +4[9] (a mildly acidic oxide)
ElectronegativityPauling scale: 2.55
Ionization energies
  • 1st: 1086.5 kJ/mol
  • 2nd: 2352.6 kJ/mol
  • 3rd: 4620.5 kJ/mol
  • (more)
Covalent radiussp3: 77 pm
sp2: 73 pm
sp: 69 pm
Van der Waals radius170 pm
Color lines in a spectral range
Spectral lines of carbon
Other properties
Natural occurrenceprimordial
Crystal structuregraphite: ​simple hexagonal (hP4)
Lattice constants
Simple hexagonal crystal structure for graphite: carbon
a = 246.14 pm
c = 670.94 pm
(at 20 °C)[3]
Crystal structurediamond: ​face-centered diamond-cubic (cF8)
Lattice constant
Diamond cubic crystal structure for diamond: carbon
a = 356.707 pm
(at 20 °C)[3]
Thermal expansiondiamond: 0.8 µm/(m⋅K) (at 25 °C)[10]
Thermal conductivitygraphite: 119–165 W/(m⋅K)
diamond: 900–2300 W/(m⋅K)
Electrical resistivitygraphite: 7.837 µΩ⋅m[11]
Magnetic orderingdiamagnetic[12]
Molar magnetic susceptibilitydiamond: −5.9×10−6 cm3/mol[13]
Young's modulusdiamond: 1050 GPa[10]
Shear modulusdiamond: 478 GPa[10]
Bulk modulusdiamond: 442 GPa[10]
Speed of sound thin roddiamond: 18,350 m/s (at 20 °C)
Poisson ratiodiamond: 0.1[10]
Mohs hardnessgraphite: 1–2
diamond: 10
CAS Number
  • atomic carbon: 7440-44-0
  • graphite: 7782-42-5
  • diamond: 7782-40-3
History
DiscoveryEgyptians and Sumerians[14] (3750 BCE)
Recognized as an element byAntoine Lavoisier[15] (1789)
Isotopes of carbon
Main isotopes Decay
abun­dance half-life (t1/2) mode pro­duct
11C synth 20.34 min β+ 11B
12C 98.9% stable
13C 1.06% stable
14C 1 ppt (1⁄1012)

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