Ferro (Fe)

chemical element with symbol Fe and atomic number 26

Atomic Number	26
Atomic Weight	55.845
Rhif màs	56

Group	8
Period	4
Block	d

Proton	26 p⁺
Niwtron	30 n⁰
Electron	26 e^-

Nodwedd Ffisegol

Atomic Radius	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
density	7.87 g/cm³ 6,980 kg/m³

Nodwedd Gemegol

egni

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
standard enthalpy of formation	415.5 kJ/mol
Electron

plisgyn yr electron	2, 8, 14, 2

valence electron	2 ⓘ

trefn yr electronnau	[Ar] 3d⁶ 4s²ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁶ 4s²

Cyflwr ocsidiad	-4, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7
Electronegatifedd	10.64 eV/particle 0.1392532 1.83
Electrophilicity Index	1.045904228706801 eV/particle
cyflwr sylfaenol mater

cyflwr mater	Solid
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
lliw	Gray #ffa500 #e06633 #e06633
appearance	lustrous metallic with a grayish tinge
Mynegrif plygiant
nodwedd ffisegol gwrthrych
Thermal Conductivity	80.4 W/(m K)
thermal expansion	0.0000118 1/K
molar heat capacity	25.1 J/(mol K)
Specific Heat Capacity	0.449 J/(g⋅K)
heat capacity ratio
electrical properties
type	Conductor
dargludedd trydanol	10 MS/m
Gwrthedd	0.00000009700000000001 Ω*m
superconductivity
magnetism
type	ferromagnetic
magnetic susceptibility (Mass)
magnetic susceptibility (Molar)
magnetic susceptibility (Volume)
magnetic ordering
Curie temperature	1,043 K
Néel temperature
strwythur
Crystal Structure	Body Centered Cubic (BCC)
lattice constant	2.87 Å
Lattice Angles	π/2, π/2, π/2
nodwedd mecanyddol deunyddiau
hardness	490 MPa 4 MPa 608 MPa
bulk modulus	170 GPa
shear modulus	82 GPa
Young's modulus	211 GPa
Poisson's ratio	0.29
speed of sound	4,910 m/s
classification
Category	Transition metals, Transition metals
CAS Group	VIIIA
IUPAC Group	VIII
Glawe Number	71
Mendeleev Number	59
Pettifor Number	61
Geochemical Class	major
Goldschmidt classification	siderophile

other

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

Isotopes of Iron

Stable Isotopes	3
Unstable Isotopes	29
Natural Isotopes	4

⁴⁵Fe

Rhif màs	45
neutron number	19
Relative Atomic Mass	45.015467 ± 0.000304 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	2.5 ± 0.2 ms
spin	3/2
nuclear quadrupole moment
dyddiad darganfod	1996
parity	+

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

Rhif màs	46
neutron number	20
Relative Atomic Mass	46.001299 ± 0.000322 Da
g-factor	0
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	13 ± 2 ms
spin	0
nuclear quadrupole moment	0
dyddiad darganfod	1992
parity	+

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

⁴⁷Fe

Rhif màs	47
neutron number	21
Relative Atomic Mass	46.992346 ± 0.000537 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	21.9 ± 0.2 ms
spin	7/2
nuclear quadrupole moment
dyddiad darganfod	1992
parity	-

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

⁴⁸Fe

Rhif màs	48
neutron number	22
Relative Atomic Mass	47.980667 ± 0.000099 Da
g-factor	0
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	45.3 ± 0.6 ms
spin	0
nuclear quadrupole moment	0
dyddiad darganfod	1987
parity	+

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

⁴⁹Fe

Rhif màs	49
neutron number	23
Relative Atomic Mass	48.973429 ± 0.000026 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	64.7 ± 0.3 ms
spin	7/2
nuclear quadrupole moment
dyddiad darganfod	1970
parity	-

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

⁵⁰Fe

Rhif màs	50
neutron number	24
Relative Atomic Mass	49.962988 ± 0.000009 Da
g-factor	0
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	152 ± 0.6 ms
spin	0
nuclear quadrupole moment	0
dyddiad darganfod	1977
parity	+

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

⁵¹Fe

Rhif màs	51
neutron number	25
Relative Atomic Mass	50.956855137 ± 0.000001501 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	305.4 ± 2.3 ms
spin	5/2
nuclear quadrupole moment
dyddiad darganfod	1972
parity	-

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

⁵²Fe

Rhif màs	52
neutron number	26
Relative Atomic Mass	51.948113364 ± 0.000000192 Da
g-factor	0
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	8.275 ± 0.008 h
spin	0
nuclear quadrupole moment	0
dyddiad darganfod	1948
parity	+

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

⁵³Fe

Rhif màs	53
neutron number	27
Relative Atomic Mass	52.945305629 ± 0.000001792 Da
g-factor	-0.18571428571429 ± 0.0028571428571429
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	8.51 ± 0.02 m
spin	7/2
nuclear quadrupole moment
dyddiad darganfod	1938
parity	-

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

⁵⁴Fe

Rhif màs	54
neutron number	28
Relative Atomic Mass	53.939608189 ± 0.000000368 Da
g-factor	0
natural abundance	5.845 ± 0.105
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes
spin	0
nuclear quadrupole moment	0
dyddiad darganfod	1923
parity	+

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

⁵⁵Fe

Rhif màs	55
neutron number	29
Relative Atomic Mass	54.938291158 ± 0.00000033 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	2.7562 ± 0.0004 y
spin	3/2
nuclear quadrupole moment
dyddiad darganfod	1939
parity	-

decay mode	intensity
ϵ (electron capture)	100%

⁵⁶Fe

Rhif màs	56
neutron number	30
Relative Atomic Mass	55.934935537 ± 0.000000287 Da
g-factor	0
natural abundance	91.754 ± 0.106
Dadfeilio ymbelydrol	stable isotope
Hanner oes	Not Radioactive ☢️
spin	0
nuclear quadrupole moment	0
dyddiad darganfod	1923
parity	+

⁵⁷Fe

Rhif màs	57
neutron number	31
Relative Atomic Mass	56.93539195 ± 0.000000287 Da
g-factor
natural abundance	2.119 ± 0.029
Dadfeilio ymbelydrol	stable isotope
Hanner oes	Not Radioactive ☢️
spin	1/2
nuclear quadrupole moment	0
dyddiad darganfod	1935
parity	-

⁵⁸Fe

Rhif màs	58
neutron number	32
Relative Atomic Mass	57.933273575 ± 0.000000339 Da
g-factor	0
natural abundance	0.282 ± 0.012
Dadfeilio ymbelydrol	stable isotope
Hanner oes	Not Radioactive ☢️
spin	0
nuclear quadrupole moment	0
dyddiad darganfod	1935
parity	+

⁵⁹Fe

Rhif màs	59
neutron number	33
Relative Atomic Mass	58.934873492 ± 0.000000354 Da
g-factor	-0.22386666666667 ± 0.00026666666666667
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	44.5 ± 0.012 d
spin	3/2
nuclear quadrupole moment
dyddiad darganfod	1938
parity	-

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

⁶⁰Fe

Rhif màs	60
neutron number	34
Relative Atomic Mass	59.934070249 ± 0.000003656 Da
g-factor	0
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	2.62 ± 0.04 My
spin	0
nuclear quadrupole moment	0
dyddiad darganfod	1957
parity	+

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

⁶¹Fe

Rhif màs	61
neutron number	35
Relative Atomic Mass	60.936746241 ± 0.0000028 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	5.98 ± 0.06 m
spin	3/2
nuclear quadrupole moment
dyddiad darganfod	1957
parity	-

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

⁶²Fe

Rhif màs	62
neutron number	36
Relative Atomic Mass	61.936791809 ± 0.000003 Da
g-factor	0
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	68 ± 2 s
spin	0
nuclear quadrupole moment	0
dyddiad darganfod	1975
parity	+

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

⁶³Fe

Rhif màs	63
neutron number	37
Relative Atomic Mass	62.940272698 ± 0.000004618 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	6.1 ± 0.6 s
spin	5/2
nuclear quadrupole moment
dyddiad darganfod	1980
parity	-

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

⁶⁴Fe

Rhif màs	64
neutron number	38
Relative Atomic Mass	63.940987761 ± 0.000005386 Da
g-factor	0
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	2 ± 0.2 s
spin	0
nuclear quadrupole moment	0
dyddiad darganfod	1980
parity	+

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

⁶⁵Fe

Rhif màs	65
neutron number	39
Relative Atomic Mass	64.945015323 ± 0.000005487 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	805 ± 10 ms
spin	1/2
nuclear quadrupole moment	0
dyddiad darganfod	1980
parity	-

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

⁶⁶Fe

Rhif màs	66
neutron number	40
Relative Atomic Mass	65.946249958 ± 0.0000044 Da
g-factor	0
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	467 ± 29 ms
spin	0
nuclear quadrupole moment	0
dyddiad darganfod	1985
parity	+

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

⁶⁷Fe

Rhif màs	67
neutron number	41
Relative Atomic Mass	66.95093 ± 0.0000041 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	394 ± 9 ms
spin	1/2
nuclear quadrupole moment	0
dyddiad darganfod	1985
parity	-

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

⁶⁸Fe

Rhif màs	68
neutron number	42
Relative Atomic Mass	67.952875 ± 0.000207 Da
g-factor	0
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	188 ± 4 ms
spin	0
nuclear quadrupole moment	0
dyddiad darganfod	1985
parity	+

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

⁶⁹Fe

Rhif màs	69
neutron number	43
Relative Atomic Mass	68.957918 ± 0.000215 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	162 ± 7 ms
spin	1/2
nuclear quadrupole moment	0
dyddiad darganfod	1992
parity	-

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

⁷⁰Fe

Rhif màs	70
neutron number	44
Relative Atomic Mass	69.960397 ± 0.000322 Da
g-factor	0
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	61.4 ± 0.7 ms
spin	0
nuclear quadrupole moment	0
dyddiad darganfod	1997
parity	+

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

⁷¹Fe

Rhif màs	71
neutron number	45
Relative Atomic Mass	70.965722 ± 0.000429 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	34.3 ± 2.6 ms
spin	7/2
nuclear quadrupole moment
dyddiad darganfod	1997
parity	+

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

⁷²Fe

Rhif màs	72
neutron number	46
Relative Atomic Mass	71.968599 ± 0.000537 Da
g-factor	0
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	17 ± 1 ms
spin	0
nuclear quadrupole moment	0
dyddiad darganfod	1997
parity	+

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

⁷³Fe

Rhif màs	73
neutron number	47
Relative Atomic Mass	72.974246 ± 0.000537 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	12.9 ± 1.6 ms
spin	7/2
nuclear quadrupole moment
dyddiad darganfod	2010
parity	+

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

⁷⁴Fe

Rhif màs	74
neutron number	48
Relative Atomic Mass	73.977821 ± 0.000537 Da
g-factor	0
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	5 ± 5 ms
spin	0
nuclear quadrupole moment	0
dyddiad darganfod	2010
parity	+

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

⁷⁵Fe

Rhif màs	75
neutron number	49
Relative Atomic Mass	74.984219 ± 0.000644 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes
spin	9/2
nuclear quadrupole moment
dyddiad darganfod	2013
parity	+

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

⁷⁶Fe

Rhif màs	76
neutron number	50
Relative Atomic Mass	75.988631 ± 0.000644 Da
g-factor	0
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes
spin	0
nuclear quadrupole moment	0
dyddiad darganfod	2017
parity	+

decay mode	intensity
β⁻ (β⁻ decay)

hanes

darganfyddwr neu ddyfeisiwr	Known to the ancients.
man darganfod
dyddiad darganfod
geirdarddiad	Anglo-Saxon: iron; symbol from Latin: ferrum (iron).
ynganiad	EYE-ern (Saesneg)

source

Abundance
Abundance in Earth's crust	56,300 mg/kg
natural abundance (cefnfor)	0.002 mg/L
natural abundance (corff dynol)	0.006 %
natural abundance (Awyrfaen)	22 %
natural abundance (Haul)	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

Ferro on ChemicalAid

AEDA subject keyword ID	17568
Australian Educational Vocabulary ID	scot/2214
Brockhaus Enzyklopädie online ID	Hola
Brockhaus Enzyklopädie online ID	eisen-20
ChEBI ID	18248
ChemSpider ID	22368
CosIng number	83503
DSSTOX compound identifier	DTXCID3023710
DSSTox substance ID	DTXSID5043710
Den Store Danske ID	jern
Dynodwr Drugbank (Alberta)	01592
ECHA Substance Infocard ID	100.028.270
Encyclopedie berbere keyword ID	2031
EuroVoc ID	981
Europeana Fashion Vocabulary ID	10552
French Vikidia ID	Fer
GND	4014002-7
Golden ID	Iron-RM8V
Great Russian Encyclopedia Online ID	2625019
Gujarati Vishwakosh entry	આયર્ન-લોહ
ID NALT	33434
InChI	InChI=1S/Fe
InChIKey	XEEYBQQBJWHFJM-UHFFFAOYSA-N
Italian Vikidia ID	Ferro
Krugosvet article	nauka_i_tehnika/himiya/ZHELEZO.html
Language of Bindings ID	2416
Latvian National Encyclopedia Online ID	149532
LiverTox ID	Iron
MeSH concept ID	M0011718
NDF-RT	N0000146032
Namuwiki ID	철(원소)
National Library of Israel J9U ID	987007560416405171
OmegaWiki Defined Meaning	2024
Open Food Facts ingredient ID	iron
PACTOLS thesaurus ID	pcrtJWWucnutA0
Probes And Drugs ID	PD009463
PubChem CID	23925
Rhif Cofrestru CAS	7439-89-6
RxNorm ID	90176
Römpp online ID	RD-05-00418
STW Thesaurus for Economics ID	14281-3
Spanish Cultural Heritage thesauri ID	materias/1000924
Spanish Vikidia ID	Hierro
Store norske leksikon ID	jern
UK Archival Thesaurus ID	f2/mt225/4347/3178
UMLS CUI	C0302583
UNESCO Thesaurus ID	concept10788
UNII	E1UOL152H7
USGS Thesaurus ID	1483
WikiSkripta ID	7294
WordNet 3.1 Synset ID	14666595-n
ZVG number	8210
dynodwr AAT	300011002
dynodwr BNE	XX524497
dynodwr BnF	11975665r
dynodwr Encyclopædia Britannica Online	science/iron-chemical-element
dynodwr Encyclopædia Universalis	fer-l-element-metallique
dynodwr Encyclopædia Universalis	fer-vue-d-ensemble
dynodwr Freebase	/m/025rw19
dynodwr Gran Enciclopedia Aragonesa	6825
dynodwr HDS	026231
dynodwr HMDB	HMDB0015531
dynodwr HSDB	604
dynodwr KBpedia	Iron
dynodwr KEGG	C00023
dynodwr Klexikon (erthygl)	Eisen
dynodwr LCAuth	sh85068131
dynodwr MeSH	D007501
dynodwr NDL	00572915
dynodwr NE.se	järn
dynodwr NKC	ph127955
dynodwr Nomisma	fe
dynodwr PSH	5775
dynodwr Quora	Iron
dynodwr Treccani	ferro
dynodwr Wolfram Language (endid)	Entity["Mineral", "Iron"]
dynodwr YSO	11738
dynodwr thesawrws RKD	37450
dynodwr yn thesawrws y BNCF	474

Ferro (Fe)

Nodwedd Ffisegol

Nodwedd Gemegol

other

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

hanes

source

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