Chrom, Krom (Cr)

grundstof med atomnummer 24

Atomnummer	24
Atommasse	51.9961
mass number	52

Gruppe	6
Periode	4
Blok	d

proton	24 p⁺
neutron	28 n⁰
elektron	24 e^-

Animated Bohrs atommodel of Cr (Chrom, Krom)

Fysisk Egenskab

Atomradius	140 pm 233 pm
molar volume	7,23 cm³/mol
Kovalent Radius	122 pm 111 pm 103 pm 140 pm 139 pm
Metallic Radius	119 pm 128 pm
Ionisk radius	73 pm 80 pm 61,5 pm 41 pm 55 pm 34,5 pm 49 pm 57 pm 26 pm 44 pm
Crystal Radius	87 pm 94 pm 75,5 pm 55 pm 69 pm 48,5 pm 63 pm 71 pm 40 pm 58 pm
Van der Waals-radius	205 pm 206 pm 225 pm 302,3 pm
massefylde	7,15 g/cm³ 6.300 kg/m³

Kemisk Egenskab

{ERROR}

energi

proton affinity	791,3 kJ/mol
electron affinity	0,666 eV/particle
ioniseringsenergi	6,76651 eV/particle 16,486305 eV/particle 30,96 eV/particle 49,16 eV/particle 69,46 eV/particle 90,635 eV/particle 160,29 eV/particle 184,76 eV/particle 209,54 eV/particle 244,52 eV/particle 270,8 eV/particle 296,74 eV/particle 354,66 eV/particle 384,163 eV/particle 1.011,62 eV/particle 1.097,2 eV/particle 1.188 eV/particle 1.294,8 eV/particle 1.394,5 eV/particle 1.495,1 eV/particle 1.634 eV/particle 1.721,183 eV/particle 7.481,8625 eV/particle 7.894,799 eV/particle

Fordampningsvarme	342 kJ/mol
smeltevarme	21 kJ/mol
standard enthalpy of formation	397,48 kJ/mol
elektron

Elektronskal	2, 8, 13, 1

Valenselektron	1 ⓘ

electron configuration	[Ar] 3d⁵ 4s¹ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵ 4s¹

Oxidationstrin	-4, -2, -1, 0, 1, 2, 3, 4, 5, 6
Elektronegativitet	9,77 eV/particle 0.1313053 1.66
Electrophilicity Index	1,1319177597467263 eV/particle
fundamental state of matter

stoffase
gaseous state of matter
Kogepunkt	2.944,15 K
Smeltepunkt	2.180,15 K
critical pressure
critical temperature
trippelpunkt
appearance
farve	Sort #808090 #8a99c7 #8a99c7
appearance	silvery metallic
Brydningsindeks
materialeegenskab
Varmeledningsevne	93,9 W/(m K)
Termisk ekspansion	0,0000049 1/K
molar heat capacity	23,35 J/(mol K)
Varmefylde	0,449 J/(g⋅K)
Adiabateksponenten
electrical properties
type	Conductor
specifik ledningsevne	7,9 MS/m
Elektrisk resistivitet	0,00000013 Ω*m
superledning
Magnetisme
type	antiferromagnetic
magnetic susceptibility (Mass)	0,0000000445 m³/Kg
magnetic susceptibility (Molar)	0,000000002314 m³/mol
magnetic susceptibility (Volume)	0,0003177
magnetic ordering
Curietemperaturen
Néel temperature	393 K
struktur
Krystalstruktur	{ERROR}
lattice constant	2,88 Å
Lattice Angles	π/2, π/2, π/2
mechanical property
hårdhed	1.120 MPa 8,5 MPa 1.060 MPa
Kompressibilitetsmodul	160 GPa
Forskydningsmodul	115 GPa
E-modul	279 GPa
Poissons forhold	0,21
speed of sound	5.940 m/s
klassificering
Kategori	Actinider, Transition metals
CAS Group	VIA
IUPAC Group	VIB
Glawe Number	55
Mendeleev Number	51
Pettifor Number	57
Geochemical Class	first series transition metal
Goldschmidt classification	litophile

øvrige

Gas Basicity	768,4 kJ/mol
polarizability	83 ± 12 a₀
C6 Dispersion Coefficient	602 a₀ 709 a₀
allotrope
Neutron cross section	3,1
Neutron Mass Absorption	0,0021
quantum number	7S3
rumgruppe	229 (Im_3m)

Isotopes of Chromium

Stable Isotopes	3
Unstable Isotopes	27
Natural Isotopes	4

⁴¹Cr

mass number	41
neutron number	17
Relative Atomic Mass	41,021911 ± 0,000429 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid
spin	3/2
nuclear quadrupole moment
opdagelsesdato
Paritet	+

decay mode	Intensitet
p (proton emission)

⁴²Cr

mass number	42
neutron number	18
Relative Atomic Mass	42,007579 ± 0,000322 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	13,3 ± 1 ms
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1996
Paritet	+

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

⁴³Cr

mass number	43
neutron number	19
Relative Atomic Mass	42,997885 ± 0,000215 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	21,1 ± 0,3 ms
spin	3/2
nuclear quadrupole moment
opdagelsesdato	1992
Paritet	+

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺ p (β⁺-delayed proton emission)	79.3%
2p (2-proton emission)	11.6%
3p	0.13%
β⁺α (β⁺-delayed α emission)

⁴⁴Cr

mass number	44
neutron number	20
Relative Atomic Mass	43,985591 ± 0,000055 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	42,8 ± 0,6 ms
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1987
Paritet	+

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

⁴⁵Cr

mass number	45
neutron number	21
Relative Atomic Mass	44,97905 ± 0,000038 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	60,9 ± 0,4 ms
spin	7/2
nuclear quadrupole moment
opdagelsesdato	1974
Paritet	-

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

⁴⁶Cr

mass number	46
neutron number	22
Relative Atomic Mass	45,968360969 ± 0,000012295 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	224,3 ± 1,3 ms
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1972
Paritet	+

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

⁴⁷Cr

mass number	47
neutron number	23
Relative Atomic Mass	46,962894995 ± 0,000005578 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	461,6 ± 1,5 ms
spin	3/2
nuclear quadrupole moment
opdagelsesdato	1972
Paritet	-

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

⁴⁸Cr

mass number	48
neutron number	24
Relative Atomic Mass	47,954029431 ± 0,000007848 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	21,56 ± 0,03 h
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1952
Paritet	+

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

⁴⁹Cr

mass number	49
neutron number	25
Relative Atomic Mass	48,95133372 ± 0,000002363 Da
g-factor	0,1904 ± 0,0012
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	42,3 ± 0,1 m
spin	5/2
nuclear quadrupole moment
opdagelsesdato	1942
Paritet	-

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

⁵⁰Cr

mass number	50
neutron number	26
Relative Atomic Mass	49,946042209 ± 0,0000001 Da
g-factor	0
natural abundance	4,345 ± 0,013
radioaktivitet	☢️ radioactive element
halveringstid
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1930
Paritet	+

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

⁵¹Cr

mass number	51
neutron number	27
Relative Atomic Mass	50,944765388 ± 0,000000178 Da
g-factor	0,26685714285714 ± 0,0014285714285714
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	27,7015 ± 0,0011 d
spin	7/2
nuclear quadrupole moment
opdagelsesdato	1940
Paritet	-

decay mode	Intensitet
ϵ (electron capture)	100%

⁵²Cr

mass number	52
neutron number	28
Relative Atomic Mass	51,940504714 ± 0,00000012 Da
g-factor	0
natural abundance	83,789 ± 0,018
radioaktivitet	stable isotope
halveringstid	Not Radioactive ☢️
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1923
Paritet	+

⁵³Cr

mass number	53
neutron number	29
Relative Atomic Mass	52,940646304 ± 0,000000124 Da
g-factor
natural abundance	9,501 ± 0,017
radioaktivitet	stable isotope
halveringstid	Not Radioactive ☢️
spin	3/2
nuclear quadrupole moment	-0,15 ± 0,05
opdagelsesdato	1930
Paritet	-

⁵⁴Cr

mass number	54
neutron number	30
Relative Atomic Mass	53,938877359 ± 0,000000142 Da
g-factor	0
natural abundance	2,365 ± 0,007
radioaktivitet	stable isotope
halveringstid	Not Radioactive ☢️
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1930
Paritet	+

⁵⁵Cr

mass number	55
neutron number	31
Relative Atomic Mass	54,940836637 ± 0,000000245 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	3,497 ± 0,003 m
spin	3/2
nuclear quadrupole moment
opdagelsesdato	1952
Paritet	-

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

⁵⁶Cr

mass number	56
neutron number	32
Relative Atomic Mass	55,940648977 ± 0,00000062 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	5,94 ± 0,1 m
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1960
Paritet	+

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

⁵⁷Cr

mass number	57
neutron number	33
Relative Atomic Mass	56,943612112 ± 0,000002 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	21,1 ± 1 s
spin	3/2
nuclear quadrupole moment
opdagelsesdato	1978
Paritet

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

⁵⁸Cr

mass number	58
neutron number	34
Relative Atomic Mass	57,944184501 ± 0,0000032 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	7 ± 0,3 s
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1980
Paritet	+

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

⁵⁹Cr

mass number	59
neutron number	35
Relative Atomic Mass	58,948345426 ± 0,00000072 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	1.050 ± 90 ms
spin	1/2
nuclear quadrupole moment	0
opdagelsesdato	1980
Paritet	-

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

⁶⁰Cr

mass number	60
neutron number	36
Relative Atomic Mass	59,949641656 ± 0,0000012 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	490 ± 10 ms
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1980
Paritet	+

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

⁶¹Cr

mass number	61
neutron number	37
Relative Atomic Mass	60,95437813 ± 0,000002 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	243 ± 9 ms
spin	5/2
nuclear quadrupole moment
opdagelsesdato	1985
Paritet	-

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

⁶²Cr

mass number	62
neutron number	38
Relative Atomic Mass	61,95614292 ± 0,0000037 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	206 ± 12 ms
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1985
Paritet	+

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

⁶³Cr

mass number	63
neutron number	39
Relative Atomic Mass	62,961161 ± 0,000078 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	129 ± 2 ms
spin	1/2
nuclear quadrupole moment	0
opdagelsesdato	1992
Paritet	-

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

⁶⁴Cr

mass number	64
neutron number	40
Relative Atomic Mass	63,963886 ± 0,000322 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	43 ± 1 ms
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1992
Paritet	+

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

⁶⁵Cr

mass number	65
neutron number	41
Relative Atomic Mass	64,969608 ± 0,000215 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	27,5 ± 2,1 ms
spin	1/2
nuclear quadrupole moment	0
opdagelsesdato	1997
Paritet	-

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

⁶⁶Cr

mass number	66
neutron number	42
Relative Atomic Mass	65,973011 ± 0,000322 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	23,8 ± 1,8 ms
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1997
Paritet	+

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

⁶⁷Cr

mass number	67
neutron number	43
Relative Atomic Mass	66,979313 ± 0,000429 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid
spin	1/2
nuclear quadrupole moment	0
opdagelsesdato	1997
Paritet	-

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

⁶⁸Cr

mass number	68
neutron number	44
Relative Atomic Mass	67,983156 ± 0,000537 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid
spin	0
nuclear quadrupole moment	0
opdagelsesdato	2009
Paritet	+

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

⁶⁹Cr

mass number	69
neutron number	45
Relative Atomic Mass	68,989662 ± 0,000537 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid
spin	7/2
nuclear quadrupole moment
opdagelsesdato	2013
Paritet	+

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

⁷⁰Cr

mass number	70
neutron number	46
Relative Atomic Mass	69,993945 ± 0,000644 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid
spin	0
nuclear quadrupole moment	0
opdagelsesdato	2013
Paritet	+

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

historie

opdager eller opfinder	Louis Vauquelin
fundsted	France
opdagelsesdato	1797
etymologi	Greek: chrôma (color).
udtale	KROH-mi-em (engelsk)

source

Forekomst
Abundance in Earth's crust	102 mg/kg
natural abundance (verdenshave)	0,0003 mg/L
natural abundance (menneskelige krop)	0,000003 %
natural abundance (Meteoroid)	0,3 %
natural abundance (Solen)	0,002 %
Abundance in Universe	0,0015 %

Nuclear Screening Constants

1	s	0.5862
2	p	3.9248
2	s	7.0162
3	d	14.2434
3	p	12.534
3	s	11.6322
4	s	18.8668

Chrom, Krom on ChemicalAid

Chrom, Krom (Cr)

Fysisk Egenskab

Kemisk Egenskab

øvrige

Isotopes of Chromium

41Cr

42Cr

43Cr

44Cr

45Cr

46Cr

47Cr

48Cr

49Cr

50Cr

51Cr

52Cr

53Cr

54Cr

55Cr

56Cr

57Cr

58Cr

59Cr

60Cr

61Cr

62Cr

63Cr

64Cr

65Cr

66Cr

67Cr

68Cr

69Cr

70Cr

historie

source

Nuclear Screening Constants

⁴¹Cr

⁴²Cr

⁴³Cr

⁴⁴Cr

⁴⁵Cr

⁴⁶Cr

⁴⁷Cr

⁴⁸Cr

⁴⁹Cr

⁵⁰Cr

⁵¹Cr

⁵²Cr

⁵³Cr

⁵⁴Cr

⁵⁵Cr

⁵⁶Cr

⁵⁷Cr

⁵⁸Cr

⁵⁹Cr

⁶⁰Cr

⁶¹Cr

⁶²Cr

⁶³Cr

⁶⁴Cr

⁶⁵Cr

⁶⁶Cr

⁶⁷Cr

⁶⁸Cr

⁶⁹Cr

⁷⁰Cr