Chroom

Chroom (Cr)

Chemiese element met atomiese nommer 24
Atomic Number24
Atomic Weight51.9961
Massagetal52
Group6
Period4
Blockd
proton24 p+
neutron28 n0
elektron24 e-
Animated Bohr model of Cr (Chroom)

Physical Property

Atoomradius
140 pm
molar volume
Covalent Radius
122 pm
Metallic Radius
119 pm
Ioonradius
73 pm
Crystal Radius
87 pm
Van der Waals radius
206 pm
density
7,15 g/cm³
Atomic Radii Of The Elements: Chroom0153045607590105120135150165180195210pmAtoomradiusCovalent RadiusMetallic RadiusVan der Waals radius

Chemical Property

energie
proton affinity
791,3 kJ/mol
electron affinity
ionization energy
6,76651 eV/particle
ionization energy of Cr (Chroom)
Verdampingswarmte
342 kJ/mol
smeltingswarmte
Vormingsentalpie
397,48 kJ/mol
elektron
Elektronskil2, 8, 13, 1
Bohr model: Cr (Chroom)
Valenselektrone1
Lewisteorie: Cr (Chroom)
elektronkonfigurasie[Ar] 3d5 4s1
1s2 2s2 2p6 3s2 3p6 3d5 4s1
Enhanced Bohr model of Cr (Chroom)
Orbital Diagram of Cr (Chroom)
Oksidasietoestand-4, -2, -1, 0, 1, 2, 3, 4, 5, 6
Elektronegatiwiteit
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
kleur
Silver
appearancesilvery metallic
Brekingsindeks
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
Geleidingsvermoë
7,9 MS/m
Elektriese resistiwiteit
0,00000013 m Ω
superconductivity
Magnetisme
typeantiferromagnetic
magnetic susceptibility (Mass)
0,0000000445 m³/Kg
magnetic susceptibility (Molar)
0,000000002314 m³/mol
magnetic susceptibility (Volume)
0,0003177
magnetic ordering
Curie temperature
Néel temperature
393 K
structure
Crystal StructureBody Centered Cubic (BCC)
lattice constant
2,88 Å
Lattice Anglesπ/2, π/2, π/2
mechanical property
hardness
8,5 MPa
Massamodulus
160 GPa
Skuifmodulus
115 GPa
Young se modulus
279 GPa
Poisson se verhouding
0,21
Spoed van klank
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
Ruimtegroep229 (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

Massagetal41
neutron number17
relative atomic mass
41,021911 ± 0,000429 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
spin3/2
nuclear quadrupole moment
ontdekkingsdatum
parity+

decay modeintensity
p (proton emission)

42Cr

Massagetal42
neutron number18
relative atomic mass
42,007579 ± 0,000322 Da
g-factor
0
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
13,3 ± 1 ms
spin0
nuclear quadrupole moment
0
ontdekkingsdatum1996
parity+

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

43Cr

Massagetal43
neutron number19
relative atomic mass
42,997885 ± 0,000215 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
21,1 ± 0,3 ms
spin3/2
nuclear quadrupole moment
ontdekkingsdatum1992
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

Massagetal44
neutron number20
relative atomic mass
43,985591 ± 0,000055 Da
g-factor
0
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
42,8 ± 0,6 ms
spin0
nuclear quadrupole moment
0
ontdekkingsdatum1987
parity+

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

45Cr

Massagetal45
neutron number21
relative atomic mass
44,97905 ± 0,000038 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
60,9 ± 0,4 ms
spin7/2
nuclear quadrupole moment
ontdekkingsdatum1974
parity-

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

46Cr

Massagetal46
neutron number22
relative atomic mass
45,968360969 ± 0,000012295 Da
g-factor
0
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
224,3 ± 1,3 ms
spin0
nuclear quadrupole moment
0
ontdekkingsdatum1972
parity+

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

47Cr

Massagetal47
neutron number23
relative atomic mass
46,962894995 ± 0,000005578 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
461,6 ± 1,5 ms
spin3/2
nuclear quadrupole moment
ontdekkingsdatum1972
parity-

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

48Cr

Massagetal48
neutron number24
relative atomic mass
47,954029431 ± 0,000007848 Da
g-factor
0
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
21,56 ± 0,03 h
spin0
nuclear quadrupole moment
0
ontdekkingsdatum1952
parity+

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

49Cr

Massagetal49
neutron number25
relative atomic mass
48,95133372 ± 0,000002363 Da
g-factor
0,1904 ± 0,0012
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
42,3 ± 0,1 m
spin5/2
nuclear quadrupole moment
ontdekkingsdatum1942
parity-

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

50Cr

Massagetal50
neutron number26
relative atomic mass
49,946042209 ± 0,0000001 Da
g-factor
0
natural abundance
4,345 ± 0,013
radioaktiwiteit☢️ radioactive element
Halfleeftyd
spin0
nuclear quadrupole moment
0
ontdekkingsdatum1930
parity+

decay modeintensity
+ (double β+ decay)

51Cr

Massagetal51
neutron number27
relative atomic mass
50,944765388 ± 0,000000178 Da
g-factor
0,26685714285714 ± 0,0014285714285714
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
27,7015 ± 0,0011 d
spin7/2
nuclear quadrupole moment
ontdekkingsdatum1940
parity-

decay modeintensity
ϵ (electron capture)100%

52Cr

Massagetal52
neutron number28
relative atomic mass
51,940504714 ± 0,00000012 Da
g-factor
0
natural abundance
83,789 ± 0,018
radioaktiwiteitStabiele isotoop
HalfleeftydNot Radioactive ☢️
spin0
nuclear quadrupole moment
0
ontdekkingsdatum1923
parity+

53Cr

Massagetal53
neutron number29
relative atomic mass
52,940646304 ± 0,000000124 Da
g-factor
natural abundance
9,501 ± 0,017
radioaktiwiteitStabiele isotoop
HalfleeftydNot Radioactive ☢️
spin3/2
nuclear quadrupole moment
-0,15 ± 0,05
ontdekkingsdatum1930
parity-

54Cr

Massagetal54
neutron number30
relative atomic mass
53,938877359 ± 0,000000142 Da
g-factor
0
natural abundance
2,365 ± 0,007
radioaktiwiteitStabiele isotoop
HalfleeftydNot Radioactive ☢️
spin0
nuclear quadrupole moment
0
ontdekkingsdatum1930
parity+

55Cr

Massagetal55
neutron number31
relative atomic mass
54,940836637 ± 0,000000245 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
3,497 ± 0,003 m
spin3/2
nuclear quadrupole moment
ontdekkingsdatum1952
parity-

decay modeintensity
β (β decay)100%

56Cr

Massagetal56
neutron number32
relative atomic mass
55,940648977 ± 0,00000062 Da
g-factor
0
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
5,94 ± 0,1 m
spin0
nuclear quadrupole moment
0
ontdekkingsdatum1960
parity+

decay modeintensity
β (β decay)100%

57Cr

Massagetal57
neutron number33
relative atomic mass
56,943612112 ± 0,000002 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
21,1 ± 1 s
spin3/2
nuclear quadrupole moment
ontdekkingsdatum1978
parity

decay modeintensity
β (β decay)100%

58Cr

Massagetal58
neutron number34
relative atomic mass
57,944184501 ± 0,0000032 Da
g-factor
0
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
7 ± 0,3 s
spin0
nuclear quadrupole moment
0
ontdekkingsdatum1980
parity+

decay modeintensity
β (β decay)100%

59Cr

Massagetal59
neutron number35
relative atomic mass
58,948345426 ± 0,00000072 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
1 050 ± 90 ms
spin1/2
nuclear quadrupole moment
0
ontdekkingsdatum1980
parity-

decay modeintensity
β (β decay)100%

60Cr

Massagetal60
neutron number36
relative atomic mass
59,949641656 ± 0,0000012 Da
g-factor
0
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
490 ± 10 ms
spin0
nuclear quadrupole moment
0
ontdekkingsdatum1980
parity+

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

61Cr

Massagetal61
neutron number37
relative atomic mass
60,95437813 ± 0,000002 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
243 ± 9 ms
spin5/2
nuclear quadrupole moment
ontdekkingsdatum1985
parity-

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

62Cr

Massagetal62
neutron number38
relative atomic mass
61,95614292 ± 0,0000037 Da
g-factor
0
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
206 ± 12 ms
spin0
nuclear quadrupole moment
0
ontdekkingsdatum1985
parity+

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

63Cr

Massagetal63
neutron number39
relative atomic mass
62,961161 ± 0,000078 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
129 ± 2 ms
spin1/2
nuclear quadrupole moment
0
ontdekkingsdatum1992
parity-

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

64Cr

Massagetal64
neutron number40
relative atomic mass
63,963886 ± 0,000322 Da
g-factor
0
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
43 ± 1 ms
spin0
nuclear quadrupole moment
0
ontdekkingsdatum1992
parity+

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

65Cr

Massagetal65
neutron number41
relative atomic mass
64,969608 ± 0,000215 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
27,5 ± 2,1 ms
spin1/2
nuclear quadrupole moment
0
ontdekkingsdatum1997
parity-

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

66Cr

Massagetal66
neutron number42
relative atomic mass
65,973011 ± 0,000322 Da
g-factor
0
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
23,8 ± 1,8 ms
spin0
nuclear quadrupole moment
0
ontdekkingsdatum1997
parity+

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

67Cr

Massagetal67
neutron number43
relative atomic mass
66,979313 ± 0,000429 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
spin1/2
nuclear quadrupole moment
0
ontdekkingsdatum1997
parity-

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

68Cr

Massagetal68
neutron number44
relative atomic mass
67,983156 ± 0,000537 Da
g-factor
0
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
spin0
nuclear quadrupole moment
0
ontdekkingsdatum2009
parity+

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

69Cr

Massagetal69
neutron number45
relative atomic mass
68,989662 ± 0,000537 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
spin7/2
nuclear quadrupole moment
ontdekkingsdatum2013
parity+

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

70Cr

Massagetal70
neutron number46
relative atomic mass
69,993945 ± 0,000644 Da
g-factor
0
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
spin0
nuclear quadrupole moment
0
ontdekkingsdatum2013
parity+

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

geskiedenis

Ontdek deurLouis Vauquelin
ligging van ontdekkingFrance
ontdekkingsdatum1797
etimologieGreek: chrôma (color).
uitspraakKROH-mi-em (Engels)

source

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

Nuclear Screening Constants

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