Template:Infobox iron

Iron, ₂₆Fe
	Template:Infobox element/symbol-to-top-image-caption
General properties
Pronunciation	Template:Infobox element/pronunciation
Appearance	lustrous metallic with a grayish tinge
Standard atomic weight (Ar, standard)	Template:Infobox element/standard atomic weight
Mass number	Template:Infobox element/symbol-to-most-stable-isotope (most stable isotope)
Iron in the periodic table
	Template:Infobox element/periodic table
Atomic number (Z)	26
Group	Template:Infobox element/group
Period	period 4
Block	d-block
Element category	Template:Infobox element/category format
Electron configuration	[Ar] 3d6 4s2
Electrons per shell	2, 8, 14, 2
Physical properties
Phase at STP	solid
Melting point	1811 K (1538 °C, 2800 °F)
Boiling point	3134 K (2862 °C, 5182 °F)
Density (near r.t.)	7.874 g/cm3
when liquid (at m.p.)	6.98 g/cm3
Heat of fusion	13.81 kJ/mol
[[Enthalpy of vaporization\|Heat of Template:Engvar]]	340 kJ/mol
Molar heat capacity	25.10 J/(mol·K)
	[[Vapor pressure\|Template:Engvar pressure]] Template:Infobox element/vapor pressure table
Atomic properties
Oxidation states	Template:Infobox element/symbol-to-oxidation-state
Electronegativity	Pauling scale: 1.83
[[Ionization energy\|Template:Engvar 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
	Template:Infobox element/spectral lines
Other properties
Crystal structure	Template:Infobox element/crystal structure Template:Infobox element/crystal structure; a=286.65 pm
Crystal structure	Template:Infobox element/crystal structure Template:Infobox element/crystal structure; between 1185–1667 K
Speed of sound thin rod	5120 m/s (at r.t.) (electrolytic)
Thermal expansion	11.8 µm/(m·K) (at 25 °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
Poisson ratio	0.29
Mohs hardness	4
Vickers hardness	608 MPa
Brinell hardness	200–1180 MPa
CAS Number	7439-89-6
History
Discovery	before 5000 BC
Main isotopes of iron
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Template:Infobox element/element navigation Template:Template reference list Expression error: Unrecognized word "template".

↑ Ram, R. S. & Bernath, P. F. (2003). "Fourier transform emission spectroscopy of the g⁴Δ-a⁴Δ system of FeCl" (PDF). Journal of Molecular Spectroscopy. 221 (2): 261. Bibcode:2003JMoSp.221..261R. doi:10.1016/S0022-2852(03)00225-X.
↑ Demazeau, G.; Buffat, B.; Pouchard, M.; Hagenmuller, P. (1982). "Recent developments in the field of high oxidation states of transition elements in oxides stabilization of Six-coordinated Iron(V)". Zeitschrift für anorganische und allgemeine Chemie. 491: 60. doi:10.1002/zaac.19824910109.
↑ Lu, J.; Jian, J.; Huang, W.; Lin, H.; Li, J; Zhou, M. (2016). "Experimental and theoretical identification of the Fe(VII) oxidation state in FeO4−". Physical Chemistry Chemical Physics. 18: 31125. Bibcode:2016PCCP...1831125L. doi:10.1039/C6CP06753K.

[1] Ram, R. S. & Bernath, P. F. (2003). "Fourier transform emission spectroscopy of the g⁴Δ-a⁴Δ system of FeCl" (PDF). Journal of Molecular Spectroscopy. 221 (2): 261. Bibcode:2003JMoSp.221..261R. doi:10.1016/S0022-2852(03)00225-X.

[2] Demazeau, G.; Buffat, B.; Pouchard, M.; Hagenmuller, P. (1982). "Recent developments in the field of high oxidation states of transition elements in oxides stabilization of Six-coordinated Iron(V)". Zeitschrift für anorganische und allgemeine Chemie. 491: 60. doi:10.1002/zaac.19824910109.

[3] Lu, J.; Jian, J.; Huang, W.; Lin, H.; Li, J; Zhou, M. (2016). "Experimental and theoretical identification of the Fe(VII) oxidation state in FeO4−". Physical Chemistry Chemical Physics. 18: 31125. Bibcode:2016PCCP...1831125L. doi:10.1039/C6CP06753K.