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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