Kroom (Cr)

chemical element with symbol Cr and atomic number 24

Atomic Number	24
Atomic Weight	51.9961
massiarv	52

Group	6
Period	4
Block	d

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

Animated Bohri aatomiteooria of Cr (Kroom)

Füüsikalised Omadused

Aatomiraadius	140 pm 233 pm
molaarruumala	7,23 cm³/mol
Covalent Radius	122 pm 111 pm 103 pm 140 pm 139 pm
Metallic Radius	119 pm 128 pm
ionic 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
density	7,15 g/cm³ 6 300 kg/m³

Keemilised Omadused

{ERROR}

energia

proton affinity	791,3 kJ/mol
Elektronafiinsus	0,666 eV/particle
ionization energy	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

aurustumissoojus	342 kJ/mol
sulamissoojus	21 kJ/mol
standard enthalpy of formation	397,48 kJ/mol
elektron

elektronkiht	2, 8, 13, 1

valentselektron	1 ⓘ

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

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

phase of matter
gaseous state of matter
Boiling Point	2 944,15 K
Melting Point	2 180,15 K
critical pressure
critical temperature
kolmikpunkt
Välimus
värvus	Black #808090 #8a99c7 #8a99c7
Välimus	silvery metallic
Murdumisnäitaja
thermodynamic material property
Thermal Conductivity	93,9 W/(m K)
soojuspaisumine	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
type	Conductor
Elektrijuhtivus	7,9 MS/m
Eritakistus	0,00000013 Ω*m
Ülijuhtivus
Magnetism
type	antiferromagnetic
Magnetiline vastuvõtlikkus (Mass)	0,0000000445 m³/Kg
Magnetiline vastuvõtlikkus (Molar)	0,000000002314 m³/mol
Magnetiline vastuvõtlikkus (Volume)	0,0003177
magnetic ordering
Curie punkt
Néel temperature	393 K
struktuur
Crystal Structure	{ERROR}
lattice constant	2,88 Å
Lattice Angles	π/2, π/2, π/2
mechanical property
kõvadus	1 120 MPa 8,5 MPa 1 060 MPa
Ruumpaisumismoodul	160 GPa
Nihkeelastsusmoodul	115 GPa
Normaalelastsusmoodul	279 GPa
Poissoni tegur	0,21
heli kiirus	5 940 m/s
Klassifitseerimine
Category	Actinides, 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

teine

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
Kvantarv	7S3
space group	229 (Im_3m)

Isotopes of Chromium

Stable Isotopes	3
Unstable Isotopes	27
Natural Isotopes	4

⁴¹Cr

massiarv	41
neutron number	17
Relative Atomic Mass	41,021911 ± 0,000429 Da
g-factor
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg
spinn	3/2
nuclear quadrupole moment
avastamise aeg
parity	+

decay mode	Intensiivsus
p (proton emission)

⁴²Cr

massiarv	42
neutron number	18
Relative Atomic Mass	42,007579 ± 0,000322 Da
g-factor	0
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	13,3 ± 1 ms
spinn	0
nuclear quadrupole moment	0
avastamise aeg	1996
parity	+

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

⁴³Cr

massiarv	43
neutron number	19
Relative Atomic Mass	42,997885 ± 0,000215 Da
g-factor
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	21,1 ± 0,3 ms
spinn	3/2
nuclear quadrupole moment
avastamise aeg	1992
parity	+

decay mode	Intensiivsus
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

massiarv	44
neutron number	20
Relative Atomic Mass	43,985591 ± 0,000055 Da
g-factor	0
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	42,8 ± 0,6 ms
spinn	0
nuclear quadrupole moment	0
avastamise aeg	1987
parity	+

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

⁴⁵Cr

massiarv	45
neutron number	21
Relative Atomic Mass	44,97905 ± 0,000038 Da
g-factor
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	60,9 ± 0,4 ms
spinn	7/2
nuclear quadrupole moment
avastamise aeg	1974
parity	-

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

⁴⁶Cr

massiarv	46
neutron number	22
Relative Atomic Mass	45,968360969 ± 0,000012295 Da
g-factor	0
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	224,3 ± 1,3 ms
spinn	0
nuclear quadrupole moment	0
avastamise aeg	1972
parity	+

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

⁴⁷Cr

massiarv	47
neutron number	23
Relative Atomic Mass	46,962894995 ± 0,000005578 Da
g-factor
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	461,6 ± 1,5 ms
spinn	3/2
nuclear quadrupole moment
avastamise aeg	1972
parity	-

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

⁴⁸Cr

massiarv	48
neutron number	24
Relative Atomic Mass	47,954029431 ± 0,000007848 Da
g-factor	0
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	21,56 ± 0,03 h
spinn	0
nuclear quadrupole moment	0
avastamise aeg	1952
parity	+

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

⁴⁹Cr

massiarv	49
neutron number	25
Relative Atomic Mass	48,95133372 ± 0,000002363 Da
g-factor	0,1904 ± 0,0012
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	42,3 ± 0,1 m
spinn	5/2
nuclear quadrupole moment
avastamise aeg	1942
parity	-

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

⁵⁰Cr

massiarv	50
neutron number	26
Relative Atomic Mass	49,946042209 ± 0,0000001 Da
g-factor	0
natural abundance	4,345 ± 0,013
radioaktiivsus	☢️ radioactive element
Poolestusaeg
spinn	0
nuclear quadrupole moment	0
avastamise aeg	1930
parity	+

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

⁵¹Cr

massiarv	51
neutron number	27
Relative Atomic Mass	50,944765388 ± 0,000000178 Da
g-factor	0,26685714285714 ± 0,0014285714285714
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	27,7015 ± 0,0011 d
spinn	7/2
nuclear quadrupole moment
avastamise aeg	1940
parity	-

decay mode	Intensiivsus
ϵ (electron capture)	100%

⁵²Cr

massiarv	52
neutron number	28
Relative Atomic Mass	51,940504714 ± 0,00000012 Da
g-factor	0
natural abundance	83,789 ± 0,018
radioaktiivsus	Stabiilne isotoop
Poolestusaeg	Not Radioactive ☢️
spinn	0
nuclear quadrupole moment	0
avastamise aeg	1923
parity	+

⁵³Cr

massiarv	53
neutron number	29
Relative Atomic Mass	52,940646304 ± 0,000000124 Da
g-factor
natural abundance	9,501 ± 0,017
radioaktiivsus	Stabiilne isotoop
Poolestusaeg	Not Radioactive ☢️
spinn	3/2
nuclear quadrupole moment	−0,15 ± 0,05
avastamise aeg	1930
parity	-

⁵⁴Cr

massiarv	54
neutron number	30
Relative Atomic Mass	53,938877359 ± 0,000000142 Da
g-factor	0
natural abundance	2,365 ± 0,007
radioaktiivsus	Stabiilne isotoop
Poolestusaeg	Not Radioactive ☢️
spinn	0
nuclear quadrupole moment	0
avastamise aeg	1930
parity	+

⁵⁵Cr

massiarv	55
neutron number	31
Relative Atomic Mass	54,940836637 ± 0,000000245 Da
g-factor
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	3,497 ± 0,003 m
spinn	3/2
nuclear quadrupole moment
avastamise aeg	1952
parity	-

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

⁵⁶Cr

massiarv	56
neutron number	32
Relative Atomic Mass	55,940648977 ± 0,00000062 Da
g-factor	0
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	5,94 ± 0,1 m
spinn	0
nuclear quadrupole moment	0
avastamise aeg	1960
parity	+

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

⁵⁷Cr

massiarv	57
neutron number	33
Relative Atomic Mass	56,943612112 ± 0,000002 Da
g-factor
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	21,1 ± 1 s
spinn	3/2
nuclear quadrupole moment
avastamise aeg	1978
parity

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

⁵⁸Cr

massiarv	58
neutron number	34
Relative Atomic Mass	57,944184501 ± 0,0000032 Da
g-factor	0
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	7 ± 0,3 s
spinn	0
nuclear quadrupole moment	0
avastamise aeg	1980
parity	+

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

⁵⁹Cr

massiarv	59
neutron number	35
Relative Atomic Mass	58,948345426 ± 0,00000072 Da
g-factor
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	1 050 ± 90 ms
spinn	1/2
nuclear quadrupole moment	0
avastamise aeg	1980
parity	-

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

⁶⁰Cr

massiarv	60
neutron number	36
Relative Atomic Mass	59,949641656 ± 0,0000012 Da
g-factor	0
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	490 ± 10 ms
spinn	0
nuclear quadrupole moment	0
avastamise aeg	1980
parity	+

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

⁶¹Cr

massiarv	61
neutron number	37
Relative Atomic Mass	60,95437813 ± 0,000002 Da
g-factor
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	243 ± 9 ms
spinn	5/2
nuclear quadrupole moment
avastamise aeg	1985
parity	-

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

⁶²Cr

massiarv	62
neutron number	38
Relative Atomic Mass	61,95614292 ± 0,0000037 Da
g-factor	0
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	206 ± 12 ms
spinn	0
nuclear quadrupole moment	0
avastamise aeg	1985
parity	+

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

⁶³Cr

massiarv	63
neutron number	39
Relative Atomic Mass	62,961161 ± 0,000078 Da
g-factor
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	129 ± 2 ms
spinn	1/2
nuclear quadrupole moment	0
avastamise aeg	1992
parity	-

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

⁶⁴Cr

massiarv	64
neutron number	40
Relative Atomic Mass	63,963886 ± 0,000322 Da
g-factor	0
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	43 ± 1 ms
spinn	0
nuclear quadrupole moment	0
avastamise aeg	1992
parity	+

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

⁶⁵Cr

massiarv	65
neutron number	41
Relative Atomic Mass	64,969608 ± 0,000215 Da
g-factor
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	27,5 ± 2,1 ms
spinn	1/2
nuclear quadrupole moment	0
avastamise aeg	1997
parity	-

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

⁶⁶Cr

massiarv	66
neutron number	42
Relative Atomic Mass	65,973011 ± 0,000322 Da
g-factor	0
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	23,8 ± 1,8 ms
spinn	0
nuclear quadrupole moment	0
avastamise aeg	1997
parity	+

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

⁶⁷Cr

massiarv	67
neutron number	43
Relative Atomic Mass	66,979313 ± 0,000429 Da
g-factor
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg
spinn	1/2
nuclear quadrupole moment	0
avastamise aeg	1997
parity	-

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

⁶⁸Cr

massiarv	68
neutron number	44
Relative Atomic Mass	67,983156 ± 0,000537 Da
g-factor	0
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg
spinn	0
nuclear quadrupole moment	0
avastamise aeg	2009
parity	+

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

⁶⁹Cr

massiarv	69
neutron number	45
Relative Atomic Mass	68,989662 ± 0,000537 Da
g-factor
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg
spinn	7/2
nuclear quadrupole moment
avastamise aeg	2013
parity	+

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

⁷⁰Cr

massiarv	70
neutron number	46
Relative Atomic Mass	69,993945 ± 0,000644 Da
g-factor	0
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg
spinn	0
nuclear quadrupole moment	0
avastamise aeg	2013
parity	+

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

ajalugu

leiutaja või avastaja	Louis Vauquelin
location of discovery	France
avastamise aeg	1797
etümoloogia	Greek: chrôma (color).
pronunciation	KROH-mi-em (inglise)

allikas

Abundance
Abundance in Earth's crust	102 mg/kg
natural abundance (ookean)	0,0003 mg/L
natural abundance (Inimkeha)	0,000003 %
natural abundance (meteoorkeha)	0,3 %
natural abundance (Päike)	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

Kroom on ChemicalAid

Kroom (Cr)

Füüsikalised Omadused

Keemilised Omadused

teine

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

ajalugu

allikas

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