Template:Infobox iron

Iron, ₂₆Fe

Template:Infobox element/symbol-to-top-image-caption
Iron
Pronunciation	Template:Infobox element/pronunciation
Allotropes	Template:Infobox element/symbol-to-allotropes
Appearance	lustrous metallic with a grayish tinge
Mass number	Template:Infobox element/symbol-to-most-stable-isotope
Iron in the periodic table
Template:Infobox element/periodic table
Atomic number (Z)	26
Group	Template:Infobox element/symbol-to-group
Period	Template:Infobox element/symbol-to-period
Block	Template:Infobox element/block format
Electron configuration	Template:Infobox element/symbol-to-electron-configuration
Electrons per shell	2, 8, 14, 2
Physical properties
Phase at STP	Template:Infobox element/symbol-to-phase
Melting point	1811 K ​(1538 °C, ​2800 °F)
Boiling point	3134 K ​(2861 °C, ​5182 °F)
Density (at 20° C)	7.874 g/cm3
when liquid (at m.p.)	6.98 g/cm3
Heat of fusion	13.81 kJ/mol
Heat of vaporization	340 kJ/mol
Molar heat capacity	25.10 J/(mol·K)
Vapor pressureTemplate:Infobox element/vapor pressure table
Atomic properties
Oxidation states	Template:Element-symbol-to-oxidation-state-data
Electronegativity	Pauling scale: 1.83
Ionization energies	1st: 762.5 kJ/mol 2nd: 1561.9 kJ/mol 3rd: 2957 kJ/mol (more)
Atomic radius	empirical: 126 pm
Covalent radius	Low spin: 132±3 pm High spin: 152±6 pm
Van der Waals radius	194 [1] pm
Template:Infobox element/spectral lines
Other properties
Natural occurrence	Template:Infobox element/symbol-to-occurrence
Crystal structure	α-Fe: ​Template:Infobox element/crystal structure (cI2)
Lattice constant	Template:Infobox element/crystal structure a = 286.65 pm (at 20 °C)
Crystal structure	γ-Fe (912–1394 °C): ​Template:Infobox element/crystal structure (cF4)
Lattice constant	Template:Infobox element/crystal structure a = 364.68 pm (at 916 °C)
Thermal expansion	12.07×10−6/K (at 20 °C)
Thermal conductivity	80.4 W/(m⋅K)
Electrical resistivity	96.1 nΩ⋅m (at 20 °C)
Curie point	1043 K
Magnetic ordering	ferromagnetic
Young's modulus	211 GPa
Shear modulus	82 GPa
Bulk modulus	170 GPa
Speed of sound thin rod	5120 m/s (at r.t.) (electrolytic)
Poisson ratio	0.29
Mohs hardness	4
Vickers hardness	608 MPa
Brinell hardness	200–1180 MPa
CAS Number	7439-89-6
History
Naming	probably from a PIE root meaning 'blood', for the color of its oxides
Discovery	before 5000 BC
Symbol	Template:Infobox element/symbol-to-symbol-etymology
Isotopes of iron Template:V

child table, as reused in {IB-Fe} Template:V
Main isotopes of Template:Infobox element/symbol-to-name
{{infobox Template:Infobox element/symbol-to-name isotopes|child=yes}}

Template:Infobox element/symbol-to--overview1

References

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