Template:Infobox iron

Iron, ₂₆Fe

Pure iron chips with a high purity iron cube
Iron
Pronunciation	/ˈaɪərn/
Allotropes	see Allotropes of iron
Appearance	lustrous metallic with a grayish tinge
Standard atomic weight Ar°(Fe)
	55.845±0.002 55.845±0.002 (abridged)
Iron in the periodic table
Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson – ↑ Fe ↓ Ru manganese ← iron → cobalt
Atomic number (Z)	26
Group	group 8
Period	period 4
Block	d-block
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 ​(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 pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 1728 1890 2091 2346 2679 3132
Atomic properties
Oxidation states	common: +2, +3 −2, −1, 0, +1, +4, +5, +6, +7
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
Color lines in a spectral range Spectral lines of iron
Other properties
Natural occurrence	primordial
Crystal structure	α-Fe: ​body-centered cubic (bcc) (cI2)
Lattice constant	Body-centered cubic crystal structure for α-Fe: iron a = 286.65 pm (at 20 °C)
Crystal structure	γ-Fe (912–1394 °C): ​face-centered cubic (fcc) (cF4)
Lattice constant	Face-centered cubic crystal structure for γ-Fe (912–1394 °C): iron 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
Discovery	before 5000 BC
Symbol	"Fe": from Latin ferrum
Isotopes of iron
Main isotopes Decay abun­dance half-life (t1/2) mode pro­duct 54Fe 5.85% stable 55Fe synth 2.73 y ε 55Mn 56Fe 91.8% stable 57Fe 2.12% stable 58Fe 0.28% stable 59Fe synth 44.6 d β− 59Co 60Fe trace 2.6×106 y β− 60Co

Fe · Iron
Mn ← ibox Mn	iso 26 Fe  [] IB-Fe [] IBisos []	→ Co ibox Co
File:Symbol category class.svg cat:Fe (0) File:Symbol category class.svg cat:Fe-isotopes (0) File:Commons-logo.svg Commons File:Wikidata-logo.svg Wikidata:Q677 File:Wiktionary-logo.svg Wiktionary
indexes by PT (page)

child table, as reused in {IB-Fe}
Main isotopes of iron
Main isotopes Decay abun­dance half-life (t1/2) mode pro­duct 54Fe 5.85% stable 55Fe synth 2.73 y ε 55Mn 56Fe 91.8% stable 57Fe 2.12% stable 58Fe 0.28% stable 59Fe synth 44.6 d β− 59Co 60Fe trace 2.6×106 y β− 60Co

Data sets read by {{Infobox element}}
Name and identifiers
Symbol etymology (11 non-trivial)
Top image (caption, alt)	caption: alt:
Pronunciation
Allotropes (overview)
Group (overview)
Period (overview)
Block (overview)
Natural occurrence
Phase at STP
Oxidation states
Spectral lines image
Electron configuration (cmt, ref)
Isotopes
Standard atomic weight
most stable isotope
File:Notification-icon-Wikidata-logo.svg Wikidata
Wikidata *
* Not used in {{Infobox element}} (2023-01-01) See also {{Index of data sets}} · Cat:data sets (0) · (this table: )

References

These references will appear in the article, but this list appears only on this page.