Iarann (Fe)

chemical element with symbol Fe and atomic number 26

Atomic Number	26
Atomic Weight	55.845
Núicléónuimhir	56

Group	8
Period	4
Block	d

prótón	26 p⁺
neodrón	30 n⁰
leictreon	26 e^-

Physical Property

Ga Adamhach	140 pm 237 pm
molar volume	7.1 cm³/mol
covalent radius	116 pm 109 pm 102 pm 140 pm 142 pm
Metallic Radius	117 pm 126 pm
ionic radius	63 pm 64 pm 61 pm 78 pm 92 pm 49 pm 58 pm 55 pm 64.5 pm 78 pm 58.5 pm 25 pm
Crystal Radius	77 pm 78 pm 75 pm 92 pm 106 pm 63 pm 72 pm 69 pm 78.5 pm 92 pm 72.5 pm 39 pm
Van der Waals radius	205 pm 204 pm 223 pm 291.2 pm
dlús	7.87 g/cm³ 6,980 kg/m³

Chemical Property

{ERROR}

fuinneamh

proton affinity	754 kJ/mol
electron affinity	0.151 eV/particle
ionization energy	7.9024678 eV/particle 16.1992 eV/particle 30.651 eV/particle 54.91 eV/particle 75 eV/particle 98.985 eV/particle 125 eV/particle 151.06 eV/particle 233.6 eV/particle 262.1 eV/particle 290.9 eV/particle 330.81 eV/particle 361 eV/particle 392.2 eV/particle 456.2 eV/particle 489.312 eV/particle 1,262.7 eV/particle 1,357.8 eV/particle 1,460 eV/particle 1,575.6 eV/particle 1,687 eV/particle 1,798.43 eV/particle 1,950.4 eV/particle 2,045.759 eV/particle 8,828.1875 eV/particle 9,277.681 eV/particle

enthalpy of vaporization	340 kJ/mol
enthalpy of fusion	13.8 kJ/mol
eantalpacht chaighdeánach an fhoirmithe	415.5 kJ/mol
leictreon

electron shell	2, 8, 14, 2

Fiúsleictreon	2 ⓘ

cumraíocht leictreon	[Ar] 3d⁶ 4s²ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁶ 4s²

Staid ocsaídiúcháine	-4, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7
Leictridhiúltacht	10.64 eV/particle 0.1392532 1.83
Electrophilicity Index	1.045904228706801 eV/particle
fundamental state of matter

phase of matter
gaseous state of matter
Boiling Point	3,134.15 K
Melting Point	1,811.15 K
critical pressure
critical temperature	9,340.15 K
triple point
appearance
dath	Black #ffa500 #e06633 #e06633
appearance	lustrous metallic with a grayish tinge
Comhéifeacht athraonta
thermodynamic material property
Thermal Conductivity	80.4 W/(m K)
Forbairt theirmeach	0.0000118 1/K
molar heat capacity	25.1 J/(mol K)
Specific Heat Capacity	0.449 J/(g⋅K)
Cóimheas saintoilleadh teasa
electrical properties
type	Conductor
electrical conductivity	10 MS/m
Friotachas	0.00000009700000000001 Ω*m
Forsheoltacht
Maighnéadas
type	ferromagnetic
So-ghabhálacht mhaighnéadach (Mass)
So-ghabhálacht mhaighnéadach (Molar)
So-ghabhálacht mhaighnéadach (Volume)
magnetic ordering
Teocht Curie	1,043 K
Néel temperature
struchtúr
Crystal Structure	{ERROR}
lattice constant	2.87 Å
Lattice Angles	π/2, π/2, π/2
airíonna meicniúla
Cruas	490 MPa 4 MPa 608 MPa
Modal toirte	170 GPa
modal fiartha	82 GPa
modal Young	211 GPa
Cóimheas Poisson	0.29
luas forleata fuaime	4,910 m/s
aicmiúchán
Category	Actinides, Transition metals
CAS Group	VIIIA
IUPAC Group	VIII
Glawe Number	71
Mendeleev Number	59
Pettifor Number	61
Geochemical Class	major
Goldschmidt classification	siderophile

eile

Gas Basicity	731.1 kJ/mol
polarizability	62 ± 4 a₀
C6 Dispersion Coefficient	482 a₀ 548 a₀
allotrope
Crosghearradh	2.56
Neutron Mass Absorption	0.0015
Uimhir chandamach	5D4
space group	229 (Im_3m)

Isotopes of Iron

Stable Isotopes	3
Unstable Isotopes	29
Natural Isotopes	4

⁴⁵Fe

Núicléónuimhir	45
neutron number	19
Mais Adamhach Choibhneasta	45.015467 ± 0.000304 Da
G-fhachtóir
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	2.5 ± 0.2 ms
Guairne	3/2
nuclear quadrupole moment
dáta fionnachtana nó tionscnaimh	1996
Paireacht	+

decay mode	intensity
2p (2-proton emission)	70%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	30%
β⁺ p (β⁺-delayed proton emission)	18.9%
2p (2-proton emission)	7.8%

⁴⁶Fe

Núicléónuimhir	46
neutron number	20
Mais Adamhach Choibhneasta	46.001299 ± 0.000322 Da
G-fhachtóir	0
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	13 ± 2 ms
Guairne	0
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh	1992
Paireacht	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺ p (β⁺-delayed proton emission)	78.7%
2p (2-proton emission)

⁴⁷Fe

Núicléónuimhir	47
neutron number	21
Mais Adamhach Choibhneasta	46.992346 ± 0.000537 Da
G-fhachtóir
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	21.9 ± 0.2 ms
Guairne	7/2
nuclear quadrupole moment
dáta fionnachtana nó tionscnaimh	1992
Paireacht	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺ p (β⁺-delayed proton emission)	88.4%

⁴⁸Fe

Núicléónuimhir	48
neutron number	22
Mais Adamhach Choibhneasta	47.980667 ± 0.000099 Da
G-fhachtóir	0
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	45.3 ± 0.6 ms
Guairne	0
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh	1987
Paireacht	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺ p (β⁺-delayed proton emission)	15.3%

⁴⁹Fe

Núicléónuimhir	49
neutron number	23
Mais Adamhach Choibhneasta	48.973429 ± 0.000026 Da
G-fhachtóir
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	64.7 ± 0.3 ms
Guairne	7/2
nuclear quadrupole moment
dáta fionnachtana nó tionscnaimh	1970
Paireacht	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺ p (β⁺-delayed proton emission)	56.7%

⁵⁰Fe

Núicléónuimhir	50
neutron number	24
Mais Adamhach Choibhneasta	49.962988 ± 0.000009 Da
G-fhachtóir	0
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	152 ± 0.6 ms
Guairne	0
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh	1977
Paireacht	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺ p (β⁺-delayed proton emission)	0%

⁵¹Fe

Núicléónuimhir	51
neutron number	25
Mais Adamhach Choibhneasta	50.956855137 ± 0.000001501 Da
G-fhachtóir
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	305.4 ± 2.3 ms
Guairne	5/2
nuclear quadrupole moment
dáta fionnachtana nó tionscnaimh	1972
Paireacht	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

⁵²Fe

Núicléónuimhir	52
neutron number	26
Mais Adamhach Choibhneasta	51.948113364 ± 0.000000192 Da
G-fhachtóir	0
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	8.275 ± 0.008 h
Guairne	0
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh	1948
Paireacht	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

⁵³Fe

Núicléónuimhir	53
neutron number	27
Mais Adamhach Choibhneasta	52.945305629 ± 0.000001792 Da
G-fhachtóir	-0.18571428571429 ± 0.0028571428571429
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	8.51 ± 0.02 m
Guairne	7/2
nuclear quadrupole moment
dáta fionnachtana nó tionscnaimh	1938
Paireacht	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

⁵⁴Fe

Núicléónuimhir	54
neutron number	28
Mais Adamhach Choibhneasta	53.939608189 ± 0.000000368 Da
G-fhachtóir	0
natural abundance	5.845 ± 0.105
Meath radaighníomhach	☢️ radioactive element
leathré
Guairne	0
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh	1923
Paireacht	+

decay mode	intensity
2β⁺ (double β⁺ decay)

⁵⁵Fe

Núicléónuimhir	55
neutron number	29
Mais Adamhach Choibhneasta	54.938291158 ± 0.00000033 Da
G-fhachtóir
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	2.7562 ± 0.0004 y
Guairne	3/2
nuclear quadrupole moment
dáta fionnachtana nó tionscnaimh	1939
Paireacht	-

decay mode	intensity
ϵ (electron capture)	100%

⁵⁶Fe

Núicléónuimhir	56
neutron number	30
Mais Adamhach Choibhneasta	55.934935537 ± 0.000000287 Da
G-fhachtóir	0
natural abundance	91.754 ± 0.106
Meath radaighníomhach	stable isotope
leathré	Not Radioactive ☢️
Guairne	0
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh	1923
Paireacht	+

⁵⁷Fe

Núicléónuimhir	57
neutron number	31
Mais Adamhach Choibhneasta	56.93539195 ± 0.000000287 Da
G-fhachtóir
natural abundance	2.119 ± 0.029
Meath radaighníomhach	stable isotope
leathré	Not Radioactive ☢️
Guairne	1/2
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh	1935
Paireacht	-

⁵⁸Fe

Núicléónuimhir	58
neutron number	32
Mais Adamhach Choibhneasta	57.933273575 ± 0.000000339 Da
G-fhachtóir	0
natural abundance	0.282 ± 0.012
Meath radaighníomhach	stable isotope
leathré	Not Radioactive ☢️
Guairne	0
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh	1935
Paireacht	+

⁵⁹Fe

Núicléónuimhir	59
neutron number	33
Mais Adamhach Choibhneasta	58.934873492 ± 0.000000354 Da
G-fhachtóir	-0.22386666666667 ± 0.00026666666666667
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	44.5 ± 0.012 d
Guairne	3/2
nuclear quadrupole moment
dáta fionnachtana nó tionscnaimh	1938
Paireacht	-

decay mode	intensity
β⁻ (β⁻ decay)	100%

⁶⁰Fe

Núicléónuimhir	60
neutron number	34
Mais Adamhach Choibhneasta	59.934070249 ± 0.000003656 Da
G-fhachtóir	0
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	2.62 ± 0.04 My
Guairne	0
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh	1957
Paireacht	+

decay mode	intensity
β⁻ (β⁻ decay)	100%

⁶¹Fe

Núicléónuimhir	61
neutron number	35
Mais Adamhach Choibhneasta	60.936746241 ± 0.0000028 Da
G-fhachtóir
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	5.98 ± 0.06 m
Guairne	3/2
nuclear quadrupole moment
dáta fionnachtana nó tionscnaimh	1957
Paireacht	-

decay mode	intensity
β⁻ (β⁻ decay)	100%

⁶²Fe

Núicléónuimhir	62
neutron number	36
Mais Adamhach Choibhneasta	61.936791809 ± 0.000003 Da
G-fhachtóir	0
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	68 ± 2 s
Guairne	0
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh	1975
Paireacht	+

decay mode	intensity
β⁻ (β⁻ decay)	100%

⁶³Fe

Núicléónuimhir	63
neutron number	37
Mais Adamhach Choibhneasta	62.940272698 ± 0.000004618 Da
G-fhachtóir
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	6.1 ± 0.6 s
Guairne	5/2
nuclear quadrupole moment
dáta fionnachtana nó tionscnaimh	1980
Paireacht	-

decay mode	intensity
β⁻ (β⁻ decay)	100%

⁶⁴Fe

Núicléónuimhir	64
neutron number	38
Mais Adamhach Choibhneasta	63.940987761 ± 0.000005386 Da
G-fhachtóir	0
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	2 ± 0.2 s
Guairne	0
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh	1980
Paireacht	+

decay mode	intensity
β⁻ (β⁻ decay)	100%

⁶⁵Fe

Núicléónuimhir	65
neutron number	39
Mais Adamhach Choibhneasta	64.945015323 ± 0.000005487 Da
G-fhachtóir
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	805 ± 10 ms
Guairne	1/2
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh	1980
Paireacht	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)

⁶⁶Fe

Núicléónuimhir	66
neutron number	40
Mais Adamhach Choibhneasta	65.946249958 ± 0.0000044 Da
G-fhachtóir	0
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	467 ± 29 ms
Guairne	0
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh	1985
Paireacht	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)

⁶⁷Fe

Núicléónuimhir	67
neutron number	41
Mais Adamhach Choibhneasta	66.95093 ± 0.0000041 Da
G-fhachtóir
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	394 ± 9 ms
Guairne	1/2
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh	1985
Paireacht	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)

⁶⁸Fe

Núicléónuimhir	68
neutron number	42
Mais Adamhach Choibhneasta	67.952875 ± 0.000207 Da
G-fhachtóir	0
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	188 ± 4 ms
Guairne	0
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh	1985
Paireacht	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	0%

⁶⁹Fe

Núicléónuimhir	69
neutron number	43
Mais Adamhach Choibhneasta	68.957918 ± 0.000215 Da
G-fhachtóir
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	162 ± 7 ms
Guairne	1/2
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh	1992
Paireacht	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)
2n (2-neutron emission)

⁷⁰Fe

Núicléónuimhir	70
neutron number	44
Mais Adamhach Choibhneasta	69.960397 ± 0.000322 Da
G-fhachtóir	0
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	61.4 ± 0.7 ms
Guairne	0
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh	1997
Paireacht	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)

⁷¹Fe

Núicléónuimhir	71
neutron number	45
Mais Adamhach Choibhneasta	70.965722 ± 0.000429 Da
G-fhachtóir
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	34.3 ± 2.6 ms
Guairne	7/2
nuclear quadrupole moment
dáta fionnachtana nó tionscnaimh	1997
Paireacht	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)
2n (2-neutron emission)

⁷²Fe

Núicléónuimhir	72
neutron number	46
Mais Adamhach Choibhneasta	71.968599 ± 0.000537 Da
G-fhachtóir	0
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	17 ± 1 ms
Guairne	0
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh	1997
Paireacht	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)
2n (2-neutron emission)

⁷³Fe

Núicléónuimhir	73
neutron number	47
Mais Adamhach Choibhneasta	72.974246 ± 0.000537 Da
G-fhachtóir
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	12.9 ± 1.6 ms
Guairne	7/2
nuclear quadrupole moment
dáta fionnachtana nó tionscnaimh	2010
Paireacht	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)
2n (2-neutron emission)

⁷⁴Fe

Núicléónuimhir	74
neutron number	48
Mais Adamhach Choibhneasta	73.977821 ± 0.000537 Da
G-fhachtóir	0
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	5 ± 5 ms
Guairne	0
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh	2010
Paireacht	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)
2n (2-neutron emission)

⁷⁵Fe

Núicléónuimhir	75
neutron number	49
Mais Adamhach Choibhneasta	74.984219 ± 0.000644 Da
G-fhachtóir
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré
Guairne	9/2
nuclear quadrupole moment
dáta fionnachtana nó tionscnaimh	2013
Paireacht	+

decay mode	intensity
β⁻ (β⁻ decay)
β⁻ n (β⁻-delayed neutron emission)
2n (2-neutron emission)

⁷⁶Fe

Núicléónuimhir	76
neutron number	50
Mais Adamhach Choibhneasta	75.988631 ± 0.000644 Da
G-fhachtóir	0
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré
Guairne	0
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh	2017
Paireacht	+

decay mode	intensity
β⁻ (β⁻ decay)

stair

fionnachtaí nó aireagóir	Known to the ancients.
áit ar tháinig air/uirthi
dáta fionnachtana nó tionscnaimh
Sanasaíocht	Anglo-Saxon: iron; symbol from Latin: ferrum (iron).
pronunciation	EYE-ern (Béarla)

foinse

Abundance
Abundance in Earth's crust	56,300 mg/kg
natural abundance (aigéan)	0.002 mg/L
natural abundance (corp an duine)	0.006 %
natural abundance (dreigeoideach)	22 %
natural abundance (An Ghrian)	0.1 %
Abundance in Universe	0.11 %

Nuclear Screening Constants

1	s	0.619
2	p	3.9112
2	s	7.401
3	d	14.8202
3	p	13.2221
3	s	12.3239
4	s	20.566

Iarann on ChemicalAid

Iarann (Fe)

Physical Property

Chemical Property

eile

Isotopes of Iron

45Fe

46Fe

47Fe

48Fe

49Fe

50Fe

51Fe

52Fe

53Fe

54Fe

55Fe

56Fe

57Fe

58Fe

59Fe

60Fe

61Fe

62Fe

63Fe

64Fe

65Fe

66Fe

67Fe

68Fe

69Fe

70Fe

71Fe

72Fe

73Fe

74Fe

75Fe

76Fe

stair

foinse

Nuclear Screening Constants

⁴⁵Fe

⁴⁶Fe

⁴⁷Fe

⁴⁸Fe

⁴⁹Fe

⁵⁰Fe

⁵¹Fe

⁵²Fe

⁵³Fe

⁵⁴Fe

⁵⁵Fe

⁵⁶Fe

⁵⁷Fe

⁵⁸Fe

⁵⁹Fe

⁶⁰Fe

⁶¹Fe

⁶²Fe

⁶³Fe

⁶⁴Fe

⁶⁵Fe

⁶⁶Fe

⁶⁷Fe

⁶⁸Fe

⁶⁹Fe

⁷⁰Fe

⁷¹Fe

⁷²Fe

⁷³Fe

⁷⁴Fe

⁷⁵Fe

⁷⁶Fe