Technical data for Iron

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
Heat of Fusion13.8 kJ/mol
Heat of Vaporization347 kJ/mol
Heat of CombustionN/A
Specific Heat449 J/(kg K)[note]
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
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

Classifications
Alternate NamesFerrum
Nams of AllotropesNone
Blockd
Group8
Period4
Electron Configuration[Ar]3d64s2
ColorGray
Discovery
2000 BC
Gas phaseN/A
CAS NumberCAS7439-89-6

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
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.