Technical data for Iron

Overview Name Iron Symbol Fe Atomic Number 26 Atomic Weight 55.845 Density 7.874 g/cm3 Melting Point 1538 °C Boiling Point 2861 °C Thermal properties Phase Solid Melting Point 1538 °C Boiling Point 2861 °C Absolute Melting Point 1811 K Absolute Boiling Point 3134 K Critical Pressure N/A Critical Temperature N/A Heat of Fusion 13.8 kJ/mol Heat of Vaporization 347 kJ/mol Specific Heat 449 J/(kg K)[note] Adiabatic Index N/A Neel Point N/A Thermal Conductivity 79 W/(m K) Thermal Expansion 0.0000118 K-1 Bulk physical properties Density 7.874 g/cm3 Density (Liquid) 6.98 g/cm3 Molar Volume 7.0923×10-6 Brinell Hardness 490 MPa Mohs Hardness 4 Vickers Hardness 608 MPa Bulk Modulus 170 GPa Shear Modulus 82 GPa Young Modulus 211 GPa Poisson Ratio 0.29 Refractive Index N/A Speed of Sound 4910 m/s Thermal Conductivity 79 W/(m K) Thermal Expansion 0.0000118 K-1 Reactivity Valence 3 Electronegativity 1.83 ElectronAffinity 15.7 kJ/mol Ionization Energies 762.5, 1561.9, 2957, 5290, 7240, 9560, 12060, 14580, 22540, 25290, 28000, 31920, 34830, 37840, 44100, 47206, 122200, 131000, 140500, 152600, 163000 kJ/mol Health and Safety DOT Hazard Class 4.1 DOT Numbers 3089 RTECS Number RTECSNO4565500 NFPA Label

Classifications Alternate Names Ferrum Names of Allotropes None Block d Group 8 Period 4 Series Transition Metal Electron Configuration [Ar]4s23d6 Color Gray Discovery 2000 BC Gas phase N/A CAS Number CAS7439-89-6 CID Number CID23925 RTECS Number RTECSNO4565500 Electrical properties Electrical Type Conductor Electrical Conductivity 1×107 S/m Resistivity 9.700000000001×10-8 m Ω Superconducting Point N/A Magnetic properties Magnetic Type Ferromagnetic Curie Point 1043 K Mass Magnetic Susceptibility N/A Molar Magnetic Susceptibility N/A Volume Magnetic Susceptibility N/A Abundances % in Universe 0.11% % in Sun 0.1% % in Meteorites 22% % in Earth's Crust 6.3% % in Oceans 3×10-7% % in Humans 0.006% Atomic dimensions and structure Atomic Radius 156 pm Covalent Radius 132 pm Van der Waals Radius N/A Crystal Structure Body-centered Cubic Lattice Angles π/2, π/2, π/2 Lattice Constants 286.65, 286.65, 286.65 pm Space Group Name Im_ 3m Space Group Number 229 Nuclear Properties Half-Life Stable Lifetime Stable Decay Mode N/A Quantum Numbers 5D4 Neutron Cross Section 2.56 Neutron Mass Absorption 0.0015 Known Isotopes 45Fe, 46Fe, 47Fe, 48Fe, 49Fe, 50Fe, 51Fe, 52Fe, 53Fe, 54Fe, 55Fe, 56Fe, 57Fe, 58Fe, 59Fe, 60Fe, 61Fe, 62Fe, 63Fe, 64Fe, 65Fe, 66Fe, 67Fe, 68Fe, 69Fe, 70Fe, 71Fe, 72Fe Stable Isotopes 54Fe, 56Fe, 57Fe, 58Fe Isotopic Abundances 54Fe 5.845% 56Fe 91.754% 57Fe 2.119% 58Fe 0.282%