Isri (Fe)

chemical element with symbol Fe and atomic number 26

Atomic Number	26
Atomic Weight	55.845
mass number	56

Group	8
Period	4
Block	d

proton	26 p⁺
neutron	30 n⁰
electron	26 e^-

Physical Property

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 6980 kg/m³

Chemical Property

{ERROR}

energy

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 1262.7 eV/particle 1357.8 eV/particle 1460 eV/particle 1575.6 eV/particle 1687 eV/particle 1798.43 eV/particle 1950.4 eV/particle 2045.759 eV/particle 8828.1875 eV/particle 9277.681 eV/particle

enthalpy of vaporization	340 kJ/mol
enthalpy of fusion	13.8 kJ/mol
standard enthalpy of formation	415.5 kJ/mol
electron

electron shell	2, 8, 14, 2

valence electron	2 ⓘ

electron configuration	[Ar] 3d⁶ 4s²ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁶ 4s²

oxidation number	-4, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7
electronegativity	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	3134.15 K
Melting Point	1811.15 K
critical pressure
critical temperature	9340.15 K
triple point
appearance
color	Black #ffa500 #e06633 #e06633
appearance	lustrous metallic with a grayish tinge
refractive index
thermodynamic material property
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
electrical conductivity	10 MS/m
electrical resistivity	0.00000009700000000001 Ω*m
superconductivity
magnetism
type	ferromagnetic
magnetic susceptibility (Mass)
magnetic susceptibility (Molar)
magnetic susceptibility (Volume)
magnetic ordering
Curie temperature	1043 K
Néel temperature
structure
Crystal Structure	{ERROR}
lattice constant	2.87 Å
Lattice Angles	π/2, π/2, π/2
mechanical property
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	4910 m/s
classification
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

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

mass number	45
neutron number	19
Relative Atomic Mass	45.015467 ± 0.000304 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	2.5 ± 0.2 ms
spin	3/2
nuclear quadrupole moment
time of discovery or invention	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

mass number	46
neutron number	20
Relative Atomic Mass	46.001299 ± 0.000322 Da
g-factor	0
natural abundance
radioactivity	☢️ radioactive element
half-life	13 ± 2 ms
spin	0
nuclear quadrupole moment	0
time of discovery or invention	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

mass number	47
neutron number	21
Relative Atomic Mass	46.992346 ± 0.000537 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	21.9 ± 0.2 ms
spin	7/2
nuclear quadrupole moment
time of discovery or invention	1992
parity	-

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

⁴⁸Fe

mass number	48
neutron number	22
Relative Atomic Mass	47.980667 ± 0.000099 Da
g-factor	0
natural abundance
radioactivity	☢️ radioactive element
half-life	45.3 ± 0.6 ms
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1987
parity	+

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

⁴⁹Fe

mass number	49
neutron number	23
Relative Atomic Mass	48.973429 ± 0.000026 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	64.7 ± 0.3 ms
spin	7/2
nuclear quadrupole moment
time of discovery or invention	1970
parity	-

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

⁵⁰Fe

mass number	50
neutron number	24
Relative Atomic Mass	49.962988 ± 0.000009 Da
g-factor	0
natural abundance
radioactivity	☢️ radioactive element
half-life	152 ± 0.6 ms
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1977
parity	+

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

⁵¹Fe

mass number	51
neutron number	25
Relative Atomic Mass	50.956855137 ± 0.000001501 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	305.4 ± 2.3 ms
spin	5/2
nuclear quadrupole moment
time of discovery or invention	1972
parity	-

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

⁵²Fe

mass number	52
neutron number	26
Relative Atomic Mass	51.948113364 ± 0.000000192 Da
g-factor	0
natural abundance
radioactivity	☢️ radioactive element
half-life	8.275 ± 0.008 h
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1948
parity	+

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

⁵³Fe

mass number	53
neutron number	27
Relative Atomic Mass	52.945305629 ± 0.000001792 Da
g-factor	-0.18571428571429 ± 0.0028571428571429
natural abundance
radioactivity	☢️ radioactive element
half-life	8.51 ± 0.02 m
spin	7/2
nuclear quadrupole moment
time of discovery or invention	1938
parity	-

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

⁵⁴Fe

mass number	54
neutron number	28
Relative Atomic Mass	53.939608189 ± 0.000000368 Da
g-factor	0
natural abundance	5.845 ± 0.105
radioactivity	☢️ radioactive element
half-life
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1923
parity	+

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

⁵⁵Fe

mass number	55
neutron number	29
Relative Atomic Mass	54.938291158 ± 0.00000033 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	2.7562 ± 0.0004 y
spin	3/2
nuclear quadrupole moment
time of discovery or invention	1939
parity	-

decay mode	intensity
ϵ (electron capture)	100%

⁵⁶Fe

mass number	56
neutron number	30
Relative Atomic Mass	55.934935537 ± 0.000000287 Da
g-factor	0
natural abundance	91.754 ± 0.106
radioactivity	stable isotope
half-life	Not Radioactive ☢️
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1923
parity	+

⁵⁷Fe

mass number	57
neutron number	31
Relative Atomic Mass	56.93539195 ± 0.000000287 Da
g-factor
natural abundance	2.119 ± 0.029
radioactivity	stable isotope
half-life	Not Radioactive ☢️
spin	1/2
nuclear quadrupole moment	0
time of discovery or invention	1935
parity	-

⁵⁸Fe

mass number	58
neutron number	32
Relative Atomic Mass	57.933273575 ± 0.000000339 Da
g-factor	0
natural abundance	0.282 ± 0.012
radioactivity	stable isotope
half-life	Not Radioactive ☢️
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1935
parity	+

⁵⁹Fe

mass number	59
neutron number	33
Relative Atomic Mass	58.934873492 ± 0.000000354 Da
g-factor	-0.22386666666667 ± 0.00026666666666667
natural abundance
radioactivity	☢️ radioactive element
half-life	44.5 ± 0.012 d
spin	3/2
nuclear quadrupole moment
time of discovery or invention	1938
parity	-

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

⁶⁰Fe

mass number	60
neutron number	34
Relative Atomic Mass	59.934070249 ± 0.000003656 Da
g-factor	0
natural abundance
radioactivity	☢️ radioactive element
half-life	2.62 ± 0.04 My
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1957
parity	+

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

⁶¹Fe

mass number	61
neutron number	35
Relative Atomic Mass	60.936746241 ± 0.0000028 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	5.98 ± 0.06 m
spin	3/2
nuclear quadrupole moment
time of discovery or invention	1957
parity	-

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

⁶²Fe

mass number	62
neutron number	36
Relative Atomic Mass	61.936791809 ± 0.000003 Da
g-factor	0
natural abundance
radioactivity	☢️ radioactive element
half-life	68 ± 2 s
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1975
parity	+

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

⁶³Fe

mass number	63
neutron number	37
Relative Atomic Mass	62.940272698 ± 0.000004618 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	6.1 ± 0.6 s
spin	5/2
nuclear quadrupole moment
time of discovery or invention	1980
parity	-

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

⁶⁴Fe

mass number	64
neutron number	38
Relative Atomic Mass	63.940987761 ± 0.000005386 Da
g-factor	0
natural abundance
radioactivity	☢️ radioactive element
half-life	2 ± 0.2 s
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1980
parity	+

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

⁶⁵Fe

mass number	65
neutron number	39
Relative Atomic Mass	64.945015323 ± 0.000005487 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	805 ± 10 ms
spin	1/2
nuclear quadrupole moment	0
time of discovery or invention	1980
parity	-

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

⁶⁶Fe

mass number	66
neutron number	40
Relative Atomic Mass	65.946249958 ± 0.0000044 Da
g-factor	0
natural abundance
radioactivity	☢️ radioactive element
half-life	467 ± 29 ms
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1985
parity	+

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

⁶⁷Fe

mass number	67
neutron number	41
Relative Atomic Mass	66.95093 ± 0.0000041 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	394 ± 9 ms
spin	1/2
nuclear quadrupole moment	0
time of discovery or invention	1985
parity	-

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

⁶⁸Fe

mass number	68
neutron number	42
Relative Atomic Mass	67.952875 ± 0.000207 Da
g-factor	0
natural abundance
radioactivity	☢️ radioactive element
half-life	188 ± 4 ms
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1985
parity	+

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

⁶⁹Fe

mass number	69
neutron number	43
Relative Atomic Mass	68.957918 ± 0.000215 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	162 ± 7 ms
spin	1/2
nuclear quadrupole moment	0
time of discovery or invention	1992
parity	-

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

⁷⁰Fe

mass number	70
neutron number	44
Relative Atomic Mass	69.960397 ± 0.000322 Da
g-factor	0
natural abundance
radioactivity	☢️ radioactive element
half-life	61.4 ± 0.7 ms
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1997
parity	+

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

⁷¹Fe

mass number	71
neutron number	45
Relative Atomic Mass	70.965722 ± 0.000429 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	34.3 ± 2.6 ms
spin	7/2
nuclear quadrupole moment
time of discovery or invention	1997
parity	+

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

⁷²Fe

mass number	72
neutron number	46
Relative Atomic Mass	71.968599 ± 0.000537 Da
g-factor	0
natural abundance
radioactivity	☢️ radioactive element
half-life	17 ± 1 ms
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1997
parity	+

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

⁷³Fe

mass number	73
neutron number	47
Relative Atomic Mass	72.974246 ± 0.000537 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	12.9 ± 1.6 ms
spin	7/2
nuclear quadrupole moment
time of discovery or invention	2010
parity	+

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

⁷⁴Fe

mass number	74
neutron number	48
Relative Atomic Mass	73.977821 ± 0.000537 Da
g-factor	0
natural abundance
radioactivity	☢️ radioactive element
half-life	5 ± 5 ms
spin	0
nuclear quadrupole moment	0
time of discovery or invention	2010
parity	+

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

⁷⁵Fe

mass number	75
neutron number	49
Relative Atomic Mass	74.984219 ± 0.000644 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life
spin	9/2
nuclear quadrupole moment
time of discovery or invention	2013
parity	+

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

⁷⁶Fe

mass number	76
neutron number	50
Relative Atomic Mass	75.988631 ± 0.000644 Da
g-factor	0
natural abundance
radioactivity	☢️ radioactive element
half-life
spin	0
nuclear quadrupole moment	0
time of discovery or invention	2017
parity	+

decay mode	intensity
β⁻ (β⁻ decay)

history

discoverer or inventor	Known to the ancients.
location of discovery
time of discovery or invention
etymology	Anglo-Saxon: iron; symbol from Latin: ferrum (iron).
pronunciation	EYE-ern (English)

source

Abundance
Abundance in Earth's crust	56300 mg/kg
natural abundance (ocean)	0.002 mg/L
natural abundance (Human body)	0.006 %
natural abundance (meteoroid)	22 %
natural abundance (La)	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

Isri on ChemicalAid

iron

Isri (Fe)

Physical Property

Chemical Property

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

history

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