The chemical symbol for Iron is Fe and its atomic number is 26.
We find it listed in the periodic table of elements in group 8 and period 4, and block d.
Iron belongs to the family of transition metals such as for example the Silver, the Bohrium, cadmium, ...
This element is stable.
Atomic number (Z) 26
Group, block group 8, d-block
Period: period 4
Element category: transition metal
Standard atomic weight (±) (Ar) 55.845(2)
Electron configuration: [Ar] 3d6 4s2
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)
Density near r.t. : 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)
Atomic properties
Oxidation states: −4, −2, −1, +1, +2, +3, +4, +5, +6 (an amphoteric oxide)
Electronegativity: Pauling scale: 1.83
Ionization energies 1st: 762.5 kJ/mol
2nd: 1561.9 kJ/mol
3rd: 2957 kJ/mol
Atomic radius empirical: 126 pm
Covalent radius: Low spin: 132±3 pm
High spin: 152±6 pm
Crystal structure: body-centered cubic a=286.65 pm
Crystal structure: face-centered cubic 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