Fe - Iron

The Iron Age was underway by 1000 BC; since then, the history of our technology based civilization has been the history of iron. Iron's strength was its first virtue and it's ferromagnetic properties are a gift. Iron is not without drawbacks, however. When in the presence of water, iron readily reacts with oxygen, making rust: a brittle, flimsy, red powder which is mostly useless.

Our students are familiar with iron III chloride, the yellow liquid used in general chemistry as a source of iron ions, staples and filings are used for the metal.

Atomic number - 26 Density g/mL 7 .86

Atomic weight u 55 .847 Melting point K 1809

Bonding radius A 1 .17 Boiling point K 3135

Atomic radius A 1 .72 Heat of vaporization kJ/mol 349 .6

Ionization Potential V 7 .87 Heat of fusion kJ/mol 13 .8

Electronegativity - 1 .83 Specific heat J/gK 0 .44

The oxide is amphoteric.
Crystal are body centered cubic.

Electron config. : [Ar] 3d⁶ 4s²

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

H He

Li Be B C N O F Ne

Na Mg Al Si P S Cl Ar

K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr

Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe

Cs Ba La* Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn

Fr Ra Ac** Rf Db Sg Bh Hs Mt 110 111 112 113

Lanthanides* Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu

Actinides ** Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr

Isotopes of Fe: Click mass number for decay process, product for element page.

046
20 msec
ECp,7.603 MeV
Cr-45
46.000858 047
27 msec
ECp,7.520 MeV
Cr-46
46.992914 049
75 msec
EC/ECp,13.030
Mn-49/Cr-48
48.973612 050
150 msec
EC/ECp,8.150
Mn-50/Cr-49
49.962994 051
305 msec
EC,8.020 MeV
Mn-51
50.956825 052
8.275 hr
EC,2.372 MeV
Mn-52
51.948116 052a
45.9 sec
EC,9.192 MeV
Mn-52
51.955438

053
8.51 min
EC,3.743 MeV
Mn-53
52.945312 054 5.845%

Stable

53.939614 055
2.73 yr
EC,2.603 MeV
Mn-55
54.938298 056 91.754%

Stable

55.934941 057 2.119%

Stable

56.935398 058 0.282%

Stable

57.933280 059
44.503 da
B-,1.565 MeV
Co-59
58.934880

060
1.5E+6 yr
B-,8.902 MeV
Co-60
59.934076 061
5.98 min
B-,3.978 MeV
Co-61
60.936748 062
68 sec
B-,2.530 MeV
Co-62
61.936770 063
6.1 sec
B-,6.320 MeV
Co-63
62.940407 064
2.0 sec
B-,4.700 MeV
Co-64
63.940847 065
0.4 sec
B-,7.900 MeV
Co-65
64.944927 067
200 nsec
B-,8.700 MeV
Co-67
66.949972

068
0.10 sec
B-,7.600 MeV
Co-68
67.952549 MASS abund.
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass

Updated by clh on 2/6/98. This is not a publication of Phoenix College.

Atomic number	-	26		Density	g/mL	7	.86
Atomic weight	u	55	.847	Melting point	K	1809
Bonding radius	A	1	.17	Boiling point	K	3135
Atomic radius	A	1	.72	Heat of vaporization	kJ/mol	349	.6
Ionization Potential	V	7	.87	Heat of fusion	kJ/mol	13	.8
Electronegativity	-	1	.83	Specific heat	J/gK	0	.44
The oxide is amphoteric.				Crystal are body centered cubic.
Electron config. : [Ar] 3d⁶ 4s²
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046 20 msec ECp,7.603 MeV Cr-45 46.000858	047 27 msec ECp,7.520 MeV Cr-46 46.992914	049 75 msec EC/ECp,13.030 Mn-49/Cr-48 48.973612	050 150 msec EC/ECp,8.150 Mn-50/Cr-49 49.962994	051 305 msec EC,8.020 MeV Mn-51 50.956825	052 8.275 hr EC,2.372 MeV Mn-52 51.948116	052a 45.9 sec EC,9.192 MeV Mn-52 51.955438
053 8.51 min EC,3.743 MeV Mn-53 52.945312	054 5.845% Stable 53.939614	055 2.73 yr EC,2.603 MeV Mn-55 54.938298	056 91.754% Stable 55.934941	057 2.119% Stable 56.935398	058 0.282% Stable 57.933280	059 44.503 da B-,1.565 MeV Co-59 58.934880
060 1.5E+6 yr B-,8.902 MeV Co-60 59.934076	061 5.98 min B-,3.978 MeV Co-61 60.936748	062 68 sec B-,2.530 MeV Co-62 61.936770	063 6.1 sec B-,6.320 MeV Co-63 62.940407	064 2.0 sec B-,4.700 MeV Co-64 63.940847	065 0.4 sec B-,7.900 MeV Co-65 64.944927	067 200 nsec B-,8.700 MeV Co-67 66.949972
068 0.10 sec B-,7.600 MeV Co-68 67.952549	MASS abund. Halflife Particle, Energy Decay Product(s) Isotopic Mass