Template:Infobox iron
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26 manganese ← iron → cobalt - ↑ Fe ↓ Ru Periodic table - Extended periodic table
General
Name, symbol, number	iron, Fe, 26
Chemical series	transition metals
Group, period, block	8, 4, d
Appearance	lustrous metallic with a grayish tinge
Standard atomic weight	55.845(2) g·mol−1
Electron configuration	Ar 3d6 4s2
Electrons per shell	2, 8, 14, 2
Physical properties
Phase	solid
Melting point	1811 K (1538 °C, 2800 °F)
Boiling point	3134 K (2862 °C, 5182 °F)
Heat of fusion	13.81 kJ·mol−1
Heat of vaporization	340 kJ·mol−1
Heat capacity	(25 °C) 25.10 J·mol−1·K−1
Vapor pressure P/Pa 1 10 100 1 k 10 k 100 k at T/K 1728 1890 2091 2346 2679 3132
Atomic properties
Crystal structure	body-centered cubic a=286.65 pm; face-centered cubic between 1185–1667 K
Oxidation states	6, 5 [1], 4, 3, 2, 1 [2] (amphoteric oxide)
Electronegativity	1.83 (Pauling scale)
Ionization energies (more)	1st: 762.5 kJ·mol−1
	2nd: 1561.9 kJ·mol−1
	3rd: 2957 kJ·mol−1
Atomic radius	140 pm
Atomic radius (calc.)	156 pm
Covalent radius	125 pm
Miscellaneous
Magnetic ordering	ferromagnetic
	1043 K
Electrical resistivity	(20 °C) 96.1 nΩ·m
Thermal conductivity	(300 K) 80.4 W·m−1·K−1
Thermal expansion	(25 °C) 11.8 µm·m−1·K−1
Speed of sound (thin rod)	(r.t.) (electrolytic) 5120 m·s−1
Young's modulus	211 GPa
Shear modulus	82 GPa
Bulk modulus	170 GPa
Poisson ratio	0.29
Mohs hardness	4.0
Vickers hardness	608 MPa
Brinell hardness	490 MPa
CAS registry number	7439-89-6
Selected isotopes
Main article: Isotopes of iron iso NA half-life DM DE (MeV) DP 54Fe 5.8% >3.1×1022y 2ε capture  ? 54Cr 55Fe syn 2.73 y ε capture 0.231 55Mn 56Fe 91.72% 56Fe is stable with 30 neutrons 57Fe 2.2% 57Fe is stable with 31 neutrons 58Fe 0.28% 58Fe is stable with 32 neutrons 59Fe syn 44.503 d β- 1.565 59Co 60Fe syn 1.5×106 y β- 3.978 60Co
References
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