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Technical data for Iron

Click any property name to see plots of that property for all the elements.

Overview
NameIron
SymbolFe
Atomic Number26
Atomic Weight55.845
Density7.874 g/cm3
Melting Point1538 °C
Boiling Point2861 °C

Thermal properties
PhaseSolid
Melting Point1538 °C
Boiling Point2861 °C
Absolute Melting Point1811 K
Absolute Boiling Point3134 K
Critical PressureN/A
Critical TemperatureN/A
Heat of Fusion13.8 kJ/mol
Heat of Vaporization347 kJ/mol
Heat of CombustionN/A
Specific Heat449 J/(kg K)[note]
Adiabatic IndexN/A
Neel PointN/A
Thermal Conductivity80 W/(m K)
Thermal Expansion0.0000118 K-1

Bulk physical properties
Density7.874 g/cm3
Density (Liquid)6.98 g/cm3
Molar Volume7.0923×10-6
Brinell Hardness490 MPa
Mohs Hardness4 MPa
Vickers Hardness608 MPa
Bulk Modulus170 GPa
Shear Modulus82 GPa
Young Modulus211 GPa
Poisson Ratio0.29
Refractive IndexN/A
Speed of Sound4910 m/s
Thermal Conductivity80 W/(m K)
Thermal Expansion0.0000118 K-1

Reactivity
Valence3
Electronegativity1.83
ElectronAffinity15.7 kJ/mol
Ionization Energies
762.5, 1561.9, 2957, 5290, 7240, 9560, 12060, 14580, 22540, 25290, 2.8×104, 31920, 34830, 37840, 4.41×104, 47206, 1.222×105, 1.31×105, 1.405×105, 1.526×105, 1.63×105 kJ/mol

Health and Safety
Autoignition Point100 °C
FlashpointN/A
Heat of CombustionN/A
DOT Hazard Class4.1
DOT Numbers3089
EU NumberN/A
NFPA Fire Rating1
NFPA HazardsN/A
NFPA Health Rating1
NFPA Reactivity Rating0
RTECS NumberRTECSNO4565500
NFPA LabelNFPA Label

Classifications
Alternate NamesFerrum
Names of AllotropesNone
Blockd
Group8
Period4
Electron Configuration[Ar]3d64s2
ColorGray
Discovery
2000 BC
Gas phaseN/A
CAS NumberCAS7439-89-6
CID NumberCID23925
Gmelin NumberN/A
NSC NumberN/A
RTECS NumberRTECSNO4565500

Electrical properties
Electrical TypeConductor
Electrical Conductivity1×107 S/m
Resistivity9.7×10-8 m Ω
Superconducting PointN/A

Magnetic properties
Magnetic TypeFerromagnetic
Curie Point1043 K
Mass Magnetic SusceptibilityN/A
Molar Magnetic SusceptibilityN/A
Volume Magnetic SusceptibilityN/A

Abundances
% in Universe0.11%
% in Sun0.1%
% in Meteorites22%
% in Earth's Crust6.3%
% in Oceans3×10-7%
% in Humans0.006%

Atomic dimensions and structure
Atomic Radius156 pm
Covalent Radius125 pm
Van der Waals RadiusN/A
Crystal StructureBody Centered Cubic
Lattice Angles
π/2, π/2, π/2
Lattice Constants
286.65, 286.65, 286.65 pm
Space Group NameIm_ 3m
Space Group Number229

Nuclear Properties
Half-LifeStable
LifetimeStable
Decay ModeN/A
Quantum Numbers5D4
Neutron Cross Section2.56
Neutron Mass Absorption0.0015
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
54Fe5.845%
56Fe91.754%
57Fe2.119%
58Fe0.282%


Notes on the properties of Iron:

Specific Heat: Value given for solid phase.

Up to date, curated data provided by
Mathematica's ElementData function from Wolfram Research, Inc.

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