Krom

Krom (Cr)

chemical element with symbol Cr and atomic number 24
Atomic Number24
Atomic Weight51.9961
Hejmara baristeyî52
Group6
Period4
Blockd
Proton24 p+
Notron28 n0
Kareva24 e-
Animated Bohr model of Cr (Krom)

Physical Property

Atomic Radius
140 pm
molar volume
Covalent Radius
122 pm
Metallic Radius
119 pm
ionic radius
73 pm
Crystal Radius
87 pm
Van der Waals radius
206 pm
density
7,15 g/cm³
Atomic Radii Of The Elements: Krom0102030405060708090100110120130140150160170180190200210pmAtomic RadiusCovalent RadiusMetallic RadiusVan der Waals radius

Chemical Property

wize
proton affinity
791,3 kJ/mol
electron affinity
ionization energy
6,76651 eV/particle
ionization energy of Cr (Krom)
enthalpy of vaporization
342 kJ/mol
enthalpy of fusion
standard enthalpy of formation
397,48 kJ/mol
Kareva
electron shell2, 8, 13, 1
Bohr model: Cr (Krom)
valence electron1
Lewis structure: Cr (Krom)
electron configuration[Ar] 3d5 4s1
1s2 2s2 2p6 3s2 3p6 3d5 4s1
Enhanced Bohr model of Cr (Krom)
Orbital Diagram of Cr (Krom)
oxidation number-4, -2, -1, 0, 1, 2, 3, 4, 5, 6
electronegativity
1.66
Electrophilicity Index
1,1319177597467263 eV/particle
fundamental state of matter
phase of matterSolid
gaseous state of matter
Boiling Point
2.944,15 K
Melting Point
2.180,15 K
critical pressure
critical temperature
triple point
appearance
color
Silver
appearancesilvery metallic
refractive index
thermodynamic material property
Thermal Conductivity
93,9 W/(m K)
thermal expansion
0,0000049 1/K
molar heat capacity
23,35 J/(mol K)
Specific Heat Capacity
0,449 J/(g⋅K)
heat capacity ratio
electrical properties
typeConductor
electrical conductivity
7,9 MS/m
electrical resistivity
0,00000013 m Ω
superconductivity
magnetism
typeantiferromagnetic
magnetic susceptibility (Mass)
0,0000000445 m³/Kg
magnetic susceptibility (Molar)
0,000000002314 m³/mol
magnetic susceptibility (Volume)
0,0003177
magnetic ordering
Germahiya Curie
Néel temperature
393 K
pêkhate
Crystal StructureBody Centered Cubic (BCC)
lattice constant
2,88 Å
Lattice Anglesπ/2, π/2, π/2
mechanical property
hardness
8,5 MPa
bulk modulus
160 GPa
shear modulus
115 GPa
Young's modulus
279 GPa
Poisson's ratio
0,21
Leza dengê
5.940 m/s
classification
CategoryTransition metals, Transition metals
CAS GroupVIA
IUPAC GroupVIB
Glawe Number55
Mendeleev Number51
Pettifor Number57
Geochemical Classfirst series transition metal
Goldschmidt classificationlitophile

other

Gas Basicity
768,4 kJ/mol
polarizability
83 ± 12 a₀
C6 Dispersion Coefficient
602 a₀
allotrope
Neutron cross section
3,1
Neutron Mass Absorption
0,0021
quantum number7S3
space group229 (Im_3m)

Isotopes of Chromium

Stable Isotopes3
Unstable Isotopes27
Natural Isotopes4
Isotopic Composition5283.79%5283.79%539.50%539.50%504.35%504.35%542.37%542.37%

41Cr

Hejmara baristeyî41
neutron number17
Giraniya atomê
41,021911 ± 0,000429 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
spin3/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê
parity+

decay modeintensity
p (proton emission)

42Cr

Hejmara baristeyî42
neutron number18
Giraniya atomê
42,007579 ± 0,000322 Da
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
13,3 ± 1 ms
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1996
parity+

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)100%
β+ p (β+-delayed proton emission)94.4%
2p (2-proton emission)

43Cr

Hejmara baristeyî43
neutron number19
Giraniya atomê
42,997885 ± 0,000215 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
21,1 ± 0,3 ms
spin3/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê1992
parity+

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)100%
β+ p (β+-delayed proton emission)79.3%
2p (2-proton emission)11.6%
3p0.13%
β+α (β+-delayed α emission)

44Cr

Hejmara baristeyî44
neutron number20
Giraniya atomê
43,985591 ± 0,000055 Da
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
42,8 ± 0,6 ms
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1987
parity+

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)100%
β+ p (β+-delayed proton emission)12%

45Cr

Hejmara baristeyî45
neutron number21
Giraniya atomê
44,97905 ± 0,000038 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
60,9 ± 0,4 ms
spin7/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê1974
parity-

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)100%
β+ p (β+-delayed proton emission)34.4%

46Cr

Hejmara baristeyî46
neutron number22
Giraniya atomê
45,968360969 ± 0,000012295 Da
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
224,3 ± 1,3 ms
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1972
parity+

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)100%

47Cr

Hejmara baristeyî47
neutron number23
Giraniya atomê
46,962894995 ± 0,000005578 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
461,6 ± 1,5 ms
spin3/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê1972
parity-

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)100%

48Cr

Hejmara baristeyî48
neutron number24
Giraniya atomê
47,954029431 ± 0,000007848 Da
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
21,56 ± 0,03 h
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1952
parity+

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)100%

49Cr

Hejmara baristeyî49
neutron number25
Giraniya atomê
48,95133372 ± 0,000002363 Da
g-factor
0,1904 ± 0,0012
natural abundance
radioactivity☢️ radioactive element
half-life
42,3 ± 0,1 m
spin5/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê1942
parity-

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)100%

50Cr

Hejmara baristeyî50
neutron number26
Giraniya atomê
49,946042209 ± 0,0000001 Da
g-factor
0
natural abundance
4,345 ± 0,013
radioactivity☢️ radioactive element
half-life
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1930
parity+

decay modeintensity
+ (double β+ decay)

51Cr

Hejmara baristeyî51
neutron number27
Giraniya atomê
50,944765388 ± 0,000000178 Da
g-factor
0,26685714285714 ± 0,0014285714285714
natural abundance
radioactivity☢️ radioactive element
half-life
27,7015 ± 0,0011 d
spin7/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê1940
parity-

decay modeintensity
ϵ (electron capture)100%

52Cr

Hejmara baristeyî52
neutron number28
Giraniya atomê
51,940504714 ± 0,00000012 Da
g-factor
0
natural abundance
83,789 ± 0,018
radioactivitystable isotope
half-lifeNot Radioactive ☢️
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1923
parity+

53Cr

Hejmara baristeyî53
neutron number29
Giraniya atomê
52,940646304 ± 0,000000124 Da
g-factor
natural abundance
9,501 ± 0,017
radioactivitystable isotope
half-lifeNot Radioactive ☢️
spin3/2
nuclear quadrupole moment
-0,15 ± 0,05
dema îcadkirinê yan keşfê1930
parity-

54Cr

Hejmara baristeyî54
neutron number30
Giraniya atomê
53,938877359 ± 0,000000142 Da
g-factor
0
natural abundance
2,365 ± 0,007
radioactivitystable isotope
half-lifeNot Radioactive ☢️
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1930
parity+

55Cr

Hejmara baristeyî55
neutron number31
Giraniya atomê
54,940836637 ± 0,000000245 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
3,497 ± 0,003 m
spin3/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê1952
parity-

decay modeintensity
β (β decay)100%

56Cr

Hejmara baristeyî56
neutron number32
Giraniya atomê
55,940648977 ± 0,00000062 Da
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
5,94 ± 0,1 m
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1960
parity+

decay modeintensity
β (β decay)100%

57Cr

Hejmara baristeyî57
neutron number33
Giraniya atomê
56,943612112 ± 0,000002 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
21,1 ± 1 s
spin3/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê1978
parity

decay modeintensity
β (β decay)100%

58Cr

Hejmara baristeyî58
neutron number34
Giraniya atomê
57,944184501 ± 0,0000032 Da
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
7 ± 0,3 s
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1980
parity+

decay modeintensity
β (β decay)100%

59Cr

Hejmara baristeyî59
neutron number35
Giraniya atomê
58,948345426 ± 0,00000072 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
1.050 ± 90 ms
spin1/2
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1980
parity-

decay modeintensity
β (β decay)100%

60Cr

Hejmara baristeyî60
neutron number36
Giraniya atomê
59,949641656 ± 0,0000012 Da
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
490 ± 10 ms
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1980
parity+

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)

61Cr

Hejmara baristeyî61
neutron number37
Giraniya atomê
60,95437813 ± 0,000002 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
243 ± 9 ms
spin5/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê1985
parity-

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)

62Cr

Hejmara baristeyî62
neutron number38
Giraniya atomê
61,95614292 ± 0,0000037 Da
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
206 ± 12 ms
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1985
parity+

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)

63Cr

Hejmara baristeyî63
neutron number39
Giraniya atomê
62,961161 ± 0,000078 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
129 ± 2 ms
spin1/2
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1992
parity-

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)

64Cr

Hejmara baristeyî64
neutron number40
Giraniya atomê
63,963886 ± 0,000322 Da
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
43 ± 1 ms
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1992
parity+

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)

65Cr

Hejmara baristeyî65
neutron number41
Giraniya atomê
64,969608 ± 0,000215 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
27,5 ± 2,1 ms
spin1/2
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1997
parity-

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)
2n (2-neutron emission)

66Cr

Hejmara baristeyî66
neutron number42
Giraniya atomê
65,973011 ± 0,000322 Da
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
23,8 ± 1,8 ms
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1997
parity+

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)
2n (2-neutron emission)

67Cr

Hejmara baristeyî67
neutron number43
Giraniya atomê
66,979313 ± 0,000429 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
spin1/2
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1997
parity-

decay modeintensity
β (β decay)
β n (β-delayed neutron emission)
2n (2-neutron emission)

68Cr

Hejmara baristeyî68
neutron number44
Giraniya atomê
67,983156 ± 0,000537 Da
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê2009
parity+

decay modeintensity
β (β decay)
β n (β-delayed neutron emission)
2n (2-neutron emission)

69Cr

Hejmara baristeyî69
neutron number45
Giraniya atomê
68,989662 ± 0,000537 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
spin7/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê2013
parity+

decay modeintensity
β (β decay)
β n (β-delayed neutron emission)
2n (2-neutron emission)

70Cr

Hejmara baristeyî70
neutron number46
Giraniya atomê
69,993945 ± 0,000644 Da
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê2013
parity+

decay modeintensity
β (β decay)
β n (β-delayed neutron emission)
2n (2-neutron emission)
Chromium crystals and 1cm3 cube

dîrok

kaşîf an îcadkerLouis Vauquelin
location of discoveryFrance
dema îcadkirinê yan keşfê1797
BêjenasîGreek: chrôma (color).
pronunciationKROH-mi-em (îngilîzî)

source

Abundance
Abundance in Earth's crust
102 mg/kg
natural abundance (Okyanûs)
0,0003 mg/L
natural abundance (human body)
0,000003 %
natural abundance (meteoroid)
0,3 %
natural abundance (Roj)
0,002 %
Abundance in Universe
0,0015 %

Nuclear Screening Constants

1s0.5862
2p3.9248
2s7.0162
3d14.2434
3p12.534
3s11.6322
4s18.8668