Technical data for Carbon

Overview Name Carbon Symbol C Atomic Number 6 Atomic Weight 12.011 Density 2.26 g/cm3[note] Melting Point 3550 °C[note] Boiling Point 4027 °C[note] Thermal properties Phase Solid Melting Point 3550 °C[note] Boiling Point 4027 °C[note] Absolute Melting Point 3823 K[note] Absolute Boiling Point 4300 K[note] Critical Pressure N/A Critical Temperature N/A Heat of Fusion 105 kJ/mol Heat of Vaporization 715 kJ/mol Specific Heat 710 J/(kg K)[note] Adiabatic Index N/A Neel Point N/A Thermal Conductivity 140 W/(m K) Thermal Expansion 7.1×10-6 K-1[note] Bulk physical properties Density 2.26 g/cm3[note] Density (Liquid) N/A Molar Volume 5.3146×10-6 Brinell Hardness N/A Mohs Hardness 0.5[note] Vickers Hardness N/A Bulk Modulus 33 GPa Shear Modulus N/A Young Modulus N/A Poisson Ratio N/A Refractive Index 2.417[note] Speed of Sound 18350 m/s Thermal Conductivity 140 W/(m K) Thermal Expansion 7.1×10-6 K-1[note] Reactivity Valence 4 Electronegativity 2.55 ElectronAffinity 153.9 kJ/mol Ionization Energies 1086.5, 2352.6, 4620.5, 6222.7, 37831, 47277 kJ/mol Health and Safety DOT Hazard Class 4.2 DOT Numbers 1361 RTECS Number RTECSHL4158550 NFPA Label

Classifications Alternate Names None Names of Allotropes Graphite, Diamond, AmorphousCarbon, Lonsdaleite, Fullerene, CarbonNanotube, Graphene Block p Group 14 Period 2 Series Nonmetal Electron Configuration [He]2s22p2 Color Black Discovery 3750 BC [note] Gas phase N/A CAS Number CAS7440-44-0 CID Number CID5462310 RTECS Number RTECSHL4158550 Electrical properties Electrical Type Conductor[note] Electrical Conductivity 100000 S/m[note] Resistivity 0.00001 m Ω[note] Superconducting Point N/A Magnetic properties Magnetic Type Diamagnetic Curie Point N/A Mass Magnetic Susceptibility -6.2×10-9 m3/Kg Molar Magnetic Susceptibility -7.45×10-11 m3/mol Volume Magnetic Susceptibility -0.000014 Abundances % in Universe 0.5% % in Sun 0.3% % in Meteorites 1.5% % in Earth's Crust 0.18% % in Oceans 0.0028% % in Humans 23% Atomic dimensions and structure Atomic Radius 67 pm Covalent Radius 76 pm Van der Waals Radius 170 pm Crystal Structure Simple Hexagonal Lattice Angles π/2, π/2, 2 π/3 Lattice Constants 246.4, 246.4, 671.1 pm Space Group Name P63/mmc Space Group Number 194 Nuclear Properties Half-Life Stable Lifetime Stable Decay Mode N/A Quantum Numbers 3P0 Neutron Cross Section 0.0035 Neutron Mass Absorption 0.000015 Known Isotopes 8C, 9C, 10C, 11C, 12C, 13C, 14C, 15C, 16C, 17C, 18C, 19C, 20C, 21C, 22C Stable Isotopes 12C, 13C Isotopic Abundances 12C 98.93% 13C 1.07%