Template:Infobox iron

manganese ← iron → cobalt - ↑ Fe ↓ Ru 26Fe Periodic table
Appearance
lustrous metallic with a grayish tinge Spectral lines of iron
General properties
Name, symbol, number	iron, Fe, 26
Pronunciation	/ˈaɪ.ərn/
Element category	transition metal
Group, period, block	8, 4, d
Standard atomic weight	55.845(2)
Electron configuration	[Ar] 3d6 4s2
Electrons per shell	2, 8, 14, 2 (Image)
Physical properties
Phase	solid
Density (near r.t.)	7.874 g·cm−3
Liquid density at m.p.	6.98 g·cm−3
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
Molar heat capacity	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
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	126 pm
Covalent radius	132±3 (low spin), 152±6 (high spin) pm
Miscellanea
Crystal structure	body-centered cubic
Magnetic ordering	ferromagnetic
	1043 K
Electrical resistivity	(20 °C) 96.1 nΩ·m
Thermal conductivity	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
Vickers hardness	608 MPa
Brinell hardness	490 MPa
CAS registry number	7439-89-6
Most stable 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 2.6×106 y β− 3.978 60Co

References

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