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 |
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Health and Safety |
DOT Hazard Class | |
DOT Numbers | 3089 |
RTECS Number | |
NFPA Label | |
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Classifications |
Alternate Names | Ferrum |
Names of Allotropes | None |
Block | d |
Group | 8 |
Period | 4 |
Series | Transition Metal |
Electron Configuration | [Ar]4s23d6 |
Color | Gray |
Discovery | |
Gas phase | N/A |
CAS Number | CAS7439-89-6 |
CID Number | |
RTECS Number | |
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 | |
Lattice Constants | 286.65, 286.65, 286.65 pm |
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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 |
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Stable Isotopes | |
Isotopic Abundances | |
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