Chemicool

Fe

26

55.847
Iron
General | States | Energies | Oxidation & Electrons |Appearance & Characteristics
Reactions | Other Forms |Radius | Conductivity | Abundance
Encyclopedia Britannica articles

General

Name Iron Symbol Fe
atomic number 26 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
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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
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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
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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
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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
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