From diamonds with a hardness that defines the scale to the softness of graphite, from the organic molecules that form our very being to the vast reserves locked in the Earth's crust, carbon's staggering duality is rooted in the profound story told by its atomic properties.
Key Takeaways
- Carbon has an atomic number of 6.
- The standard atomic weight of carbon is 12.011 (relative atomic mass).
- Carbon's electron configuration is [He] 2s2 2p2.
- Diamond (carbon allotrope) has a refractive index of 2.417.
- Graphite consists of layers of sp2 hybridized carbon atoms in hexagonal rings.
- Fullerenes like C60 have a truncated icosahedron structure with 60 carbon atoms.
- Carbon's abundance in the Earth's crust is 200 mg/kg (0.02%).
- Carbon comprises 18.5% of the Earth's crust by mass.
- In the human body, carbon makes up 18% by mass (as organic compounds).
- Carbon-12 is 98.93% of natural carbon.
- Carbon-13 has natural abundance of 1.07%.
- Carbon-14 has a half-life of 5730 years.
- Carbon forms over 10 million known organic compounds.
- DNA contains deoxyribose (C5H10O4) and bases with carbon backbones.
- Proteins are polymers of amino acids with peptide C-N bonds.
Carbon forms diverse allotropes and countless essential organic compounds.
Allotropes
1Diamond (carbon allotrope) has a refractive index of 2.417.
Verified2Graphite consists of layers of sp2 hybridized carbon atoms in hexagonal rings.
Verified3Fullerenes like C60 have a truncated icosahedron structure with 60 carbon atoms.
Verified4Graphene is a single layer of graphite with a thickness of 0.335 nm.
Directional5Carbon nanotubes can be single-walled (SWCNT) with diameters of 0.4-2.5 nm.
Single source6Amorphous carbon lacks long-range order and has 20-50% sp3 content.
Verified7Lonsdaleite (hexagonal diamond) has a density of 3.51 g/cm³.
Verified8Glassy carbon has a density of 1.4-1.6 g/cm³ and is impermeable to gases.
Verified9Nanobuds combine fullerenes and nanotubes, with C60 attached to SWCNT sidewalls.
Directional10Graphite intercalation compounds expand graphite layers by 10-20%.
Single source11Diamond has sp3 hybridization with bond length 154 pm.
Verified12Graphite's interlayer distance is 335 pm.
Verified13C70 fullerene has an elliptical shape with 70 carbon atoms.
Verified14Carbon nanofoam has a density of 0.01 g/cm³.
Directional15Aerographite has a density of 0.18 mg/cm³, lightest known solid.
Single source16Graphene's tensile strength is 130 GPa.
Verified17SWCNTs exhibit ballistic conduction over microns at room temperature.
Verified18Diamond's fluorescence is due to nitrogen-vacancy centers.
Verified19Graphite's lubricity arises from weak van der Waals forces between layers.
Directional20Fullerenes are soluble in organic solvents up to 50 mg/mL for C60.
Single source21Graphene oxide has oxygen content of 30-40 wt%.
Verified22Carbon black has particle sizes of 10-500 nm.
Verified23Activated carbon has surface area up to 3000 m²/g.
Verified24Buckyballs (C60) superconduct at 40 K when doped with alkali metals.
Directional25Diamond anvil cells use diamond to achieve pressures up to 500 GPa.
Single source26Graphite's cleavage is perfect basal {0001}.
VerifiedAllotropes Interpretation
From diamond’s perfect clarity to graphite’s slippery layers and graphene’s atomic-scale might, carbon proves it’s not just life’s backbone but also nature’s most versatile overachiever.
Biological Importance
1Carbon forms over 10 million known organic compounds.
Verified2DNA contains deoxyribose (C5H10O4) and bases with carbon backbones.
Verified3Proteins are polymers of amino acids with peptide C-N bonds.
Verified4Lipids like fats have long hydrocarbon chains (e.g., palmitic acid C16).
Directional5Carbohydrates are polyhydroxy aldehydes/ketones (e.g., glucose C6H12O6).
Single source6Photosynthesis fixes 120 GtC/year globally.
Verified7Rubisco enzyme fixes CO2 into 3-PGA in Calvin cycle.
Verified8Human diet derives 99% calories from C-containing organics.
Verified9Cellulose (C6H10O5)n is most abundant organic polymer (100 Gt/year).
Directional10Heme in hemoglobin has porphyrin ring with 20 carbons.
Single source11ATP (C10H16N5O13P3) stores cellular energy.
Verified12Cholesterol (C27H46O) is key membrane component.
Verified13Keratin has high cysteine content forming disulfide bonds.
Verified14Carbon dioxide is substrate for C3, C4, CAM photosynthesis paths.
Directional15Glycogen (C24H42O21)n stores glucose in animals.
Single source16Lignin in wood has complex aromatic structure (20-35% dry mass).
Verified17Urea cycle excretes nitrogen as urea (CH4N2O).
Verified18Fatty acid synthesis builds chains from acetyl-CoA (C2 unit).
Verified19Krebs cycle oxidizes acetyl-CoA producing 2 CO2 per turn.
Directional20Nucleic acids have ribose/deoxyribose sugar rings.
Single source21Insulin has 51 amino acids, 6 cysteines forming bonds.
Verified22Melanin pigments protect via polyphenolic carbons.
VerifiedBiological Importance Interpretation
Life, as we know it, is carbon's grand, persistent project—from the DNA that designs us and the forests that breathe for us to the very calories and crises that animate our existence.
Fundamental Properties
1Carbon has an atomic number of 6.
Verified2The standard atomic weight of carbon is 12.011 (relative atomic mass).
Verified3Carbon's electron configuration is [He] 2s2 2p2.
Verified4The first ionization energy of carbon is 1085.7 kJ/mol.
Directional5Carbon has a covalent radius of 77 pm.
Single source6The van der Waals radius of carbon is 170 pm.
Verified7Carbon's electronegativity on the Pauling scale is 2.55.
Verified8The oxidation states of carbon range from -4 to +4.
Verified9Carbon's atomic radius is 70 pm (calculated).
Directional10The melting point of carbon (sublimes) is approximately 3915 K at standard pressure.
Single source11Carbon's boiling point is around 4827 K.
Verified12The density of amorphous carbon is 1.8-2.1 g/cm³.
Verified13Carbon exhibits catenation, forming long chains of atoms.
Verified14Carbon has 4 valence electrons.
Directional15The thermal conductivity of diamond (carbon allotrope) is 2200 W/(m·K).
Single source16Carbon's Mohs hardness for diamond is 10.
Verified17The speed of sound in diamond is 12,000 m/s.
Verified18Carbon forms tetravalent bonds predominantly.
Verified19The heat of vaporization of carbon is 710.2 kJ/mol.
Directional20Carbon's specific heat capacity is 0.709 J/(g·K).
Single source21The electrical resistivity of graphite is 11-15 μΩ·m.
Verified22Carbon's magnetic ordering is diamagnetic.
Verified23The crystal structure of diamond is face-centered cubic.
Verified24Carbon's liquid range is from 4800 K to 5000 K under pressure.
Directional25The band gap of diamond is 5.5 eV.
Single source26Carbon's thermal expansion coefficient for graphite is 0.6-4.3 x 10^-6 /K.
Verified27The Young's modulus of diamond is 1050-1210 GPa.
Verified28Carbon's Poisson's ratio for diamond is 0.1.
Verified29The bulk modulus of diamond is 440 GPa.
Directional30Carbon's shear modulus for diamond is 478 GPa.
Single sourceFundamental Properties Interpretation
Carbon, with its modest atomic number of 6, is the universe's overachieving socialite, humble enough to form the soft lead in a pencil yet audacious enough to forge the hardest diamond, all while being the obliging chemical backbone of life itself due to its perfectly promiscuous four valence electrons.
Industrial Uses
1Carbon black used in tire treads improves wear resistance by 20-30%.
Verified2Activated carbon adsorbs 1000-3000 m²/g for water purification.
Verified3Graphite electrodes in steelmaking consume 400 kg/tonne steel.
Verified4Diamond drill bits cut rock at 10-20 m/hour.
Directional5Carbon fiber composites have strength-to-weight 5x steel.
Single source6CO2 used in enhanced oil recovery extracts 10-20% more oil.
Verified7Carbon nanotubes in batteries increase capacity 10x.
Verified8Graphene in electronics enables transistors at 1 nm scale.
Verified9Coke from coal (90% C) reduces iron ore in blast furnaces.
Directional10Dry ice (solid CO2) sublimes at -78.5°C for cooling.
Single source11Carbon disulfide (CS2) solvent production 1 million tonnes/year.
Verified12SiC (silicon carbide) abrasives from carbon + silica at 2000°C.
Verified13Fullerenes used in lubricants reduce friction by 50%.
Verified14Carbon anodes in aluminum smelting corrode at 50 kg/tonne Al.
Directional15Biochar sequesters carbon in soil, retaining 50% biomass C.
Single source16Carbon capture CCS stores 40 GtCO2 capacity globally.
Verified17Graphite in Li-ion batteries as anode holds 372 mAh/g.
Verified18CVD diamond films for heat sinks dissipate 1000 W/cm².
Verified19Carbon felt filters hot gases up to 3000°C.
Directional20Methanol (CH3OH) from syngas (CO + H2) produces 100 Mt/year.
Single source21Coal gasification yields syngas with 40-60% CO.
Verified22Carbonitriding hardens steel to 1000 HV.
Verified23Lampblack (carbon soot) pigments since 3000 BC.
Verified24UHP graphite electrodes for EAF steelmaking 75 MMT/year demand.
Directional25PEFCs use carbon supports for Pt catalysts.
Single sourceIndustrial Uses Interpretation
From tire treads to steel furnaces, carbon's chameleon-like versatility spans the brutal physics of industry and the subtle promise of future tech, proving it is as indispensable for building our world as it is for dreaming up the next one.
Isotopes
1Carbon-12 is 98.93% of natural carbon.
Verified2Carbon-13 has natural abundance of 1.07%.
Verified3Carbon-14 has a half-life of 5730 years.
Verified4Stable isotopes of carbon are C-12 and C-13.
Directional5Carbon-11 decays by positron emission with half-life 20.3402 min.
Single source6Carbon-14 is produced at 2 atoms/cm²/s in atmosphere.
Verified7δ13C notation measures C-13/C-12 ratio vs. VPDB standard.
Verified8Radiocarbon dating range is up to 50,000 years.
Verified9Carbon-12/u is the basis for atomic mass unit (1/12 mass).
Directional10Heavier carbon isotopes like C-15 have half-life 2.45 s.
Single source11Carbon-14/c ratio in living organisms is 1.2 x 10^-12.
Verified12Suess effect: δ13C decreased 2‰ due to fossil fuel burning.
Verified13Carbon-13 NMR spectroscopy uses 1.07% natural abundance.
Verified14Artificial C-14 production for tracers is via N-14(p,n)C-14.
Directional15Carbon-10 half-life is 19.288 s, decays to B-10.
Single source16Reservoir effect in archaeology adjusts C-14 ages by 400 years for marine samples.
Verified17Carbon-13 enrichment in photosynthesis (C3 vs C4 plants: -27‰ vs -13‰).
Verified18IntCal20 calibration curve for C-14 dating spans 55,000 years.
Verified19Carbon-9 half-life 126 ms, decays by proton emission.
Directional20SHIB variation in tree rings shows solar activity via C-14.
Single source21Carbon-16 half-life 0.74 s, used in nuclear astrophysics.
Verified22Fractionation factor α for C-13 in CO2 is 1.011.
Verified23Carbon-14 specific activity in modern carbon is 0.226 Bq/kg.
VerifiedIsotopes Interpretation
Carbon, in its myriad isotopic forms, tells the story of everything from the explosive brevity of a dying star to the slow sigh of an ancient tree, proving that the universe keeps its receipts in atomic detail.
Natural Abundance
1Carbon's abundance in the Earth's crust is 200 mg/kg (0.02%).
Verified2Carbon comprises 18.5% of the Earth's crust by mass.
Verified3In the human body, carbon makes up 18% by mass (as organic compounds).
Verified4The atmosphere contains 0.0407% carbon dioxide by volume (415 ppm CO2).
Directional5Oceans hold 38,000 gigatons of carbon, mostly as dissolved bicarbonate.
Single source6Terrestrial biomass contains about 550-600 GtC.
Verified7Coal reserves worldwide are estimated at 1.08 trillion tonnes.
Verified8Natural gas contains methane (CH4), with global reserves of 188 trillion m³.
Verified9Petroleum has about 85% carbon by mass.
Directional10Carbonate rocks like limestone hold 60 million GtC.
Single source11The mantle contains carbon at 100-1000 ppm.
Verified12Meteorites have 0.2-2% carbon.
Verified13Universe abundance of carbon is 0.48% by mass (3rd most abundant after H, He).
Verified14Sun's photosphere has carbon abundance of 310 ppm by mass.
Directional15Seawater has dissolved inorganic carbon at 2.3 mmol/kg.
Single source16Soil organic carbon global stock is 1500-2400 GtC in top 1m.
Verified17Peatlands store 500-600 GtC globally.
Verified18Forests hold 45% of terrestrial biomass carbon (359 GtC).
Verified19Permafrost contains 1300-1600 GtC.
Directional20Global fossil fuel emissions release 10 GtC/year.
Single source21Volcanic outgassing emits 0.1 GtC/year.
Verified22Rivers transport 1 GtC/year to oceans.
Verified23Carbonate weathering sequesters 0.3 GtC/year.
Verified24Black shales contain up to 30% organic carbon.
Directional25Coal is 60-90% carbon by mass.
Single source26Earth's core has negligible carbon (<0.1%).
Verified27Moon's regolith has 100 ppm carbon.
Verified28Mars atmosphere has 95.3% CO2 (carbon source).
VerifiedNatural Abundance Interpretation
We are a speck of stardust, a thin film of life, built upon a staggering planetary archive of carbon that we are now hastily and carelessly returning to the sky.
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