Iron 26
Panagway lustrous metallic with a grayish tingeSpectral lines of iron Kinatibuk-ang mga kinaiya Ngalan,simbolo ,kaiphan iron, Fe, 26 Paglitok /ˈ aɪ . ər n Kategoriyang elemento puthaw nga transisyon Group ,period ,block 8 , 4 ,d Gibug-aton sa atomo 55.845(2) Kontorno sa elektron [Ar ] 3d6 4s2 Electron shells of iron (2, 8, 14, 2) History Pagkadiskobre before5000 BC Physical properties Phase magahi Density (nearr.t. )7.874 g·cm−3 Liquiddensity atm.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 13.81kJ·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 Oxidation states 6, 5,[ 1] 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 126pm Covalent radius 132±3 (low spin), 152±6 (high spin) pm Miscellanea Crystal structure body-centered cubic
a =286.65 pm;face-centered cubic
between 1185–1667 KMagnetic 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)−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 · r 
