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Iron

26
Fe
55.847
Iron
 General | States | Energies | Oxidation & Electrons | Appearance & Characteristics | Reactions | Other Forms Radius | Conductivity | Abundance

General:

Name: Iron Symbol: Fe
Group: Trans. Met. Atomic weight: 55.847
Density @ 293 K: 7.86 g/cm3 Atomic volume: 7.1 cm3/mol
Group: Trans. Met. discovered: 0

States:

state (s, l, g): s
melting point: 1808.2 K boiling point: 3023 K
Heat of fusion: 13.80 kJ/mol Heat of vaporization: 349.60 kJ/mol

Energies:

1st ionization energy: 759.3 kJ/mole
electronegativity: 1.9 2nd ionization energy: 1561.1 kJ/mole
electron affinity: 15.7 kJ/mole 3rd ionization energy: 2957.3 kJ/mole
Specific heat: 0.44 J/gK heat atomization: 418 kJ/mole atoms

Oxidation & Electrons:

Shells: 2,8,14,2 electron configuration: [Ar] 3d6 4s2
minimum oxidation number: -2 maximum oxidation number: 6
min. common oxidation no.: 0 max. common oxidation no.: 3

Appearance & Characteristics:

structure: bcc: body-centered cubic color: gray
uses: steel toxicity:
hardness: 4.5 mohs characteristics: fairly soft when pure

Reactions:

reaction with air: mild, =>Fe3O4
reaction with 6M HCl: mild, =>H2, FeCl2 reaction with 6M HCl: mild, =>H2, FeCl2
reaction with 15M HNO3: passivated reaction with 6M NaOH:

Other Forms:

number of isotopes: 4 hydride(s): none
oxide(s): FeO Fe3O4 Fe2O3 chloride(s): FeCl2 FeCl3

Radius:

ionic radius (2- ion): pm ionic radius (1- ion): pm
atomic radius: 126 pm ionic radius (1+ ion): pm
ionic radius (2+ ion): 83.5 pm ionic radius (3+ ion): 73.8 pm

Conductivity:

thermal conductivity: 72.8 J/m-sec-deg
electrical conductivity: 102.987 1/mohm-cm polarizability: 8.4 A^3

Abundance:

source: Hematite,magnetite(oxide)
rel. abund. solar system: 5.954 log abundance earth's crust: 4.8 log
cost, pure: 6.7 $/100g cost, bulk: 0.021 $/100g