Krypton (Kr)

chemical element with symbol Kr and atomic number 36; rare gas

Atomic Number	36
Atomic Weight	83.798
mass number	84

Group	18
Period	4
Block	p

proton	36 p⁺
neutron	48 n⁰
electron	36 e^-

Physical Property

Atomic Radius	212 pm
molar volume	32.2 cm³/mol
covalent radius	117 pm 121 pm 108 pm 116 pm
Metallic Radius
ionic radius
Crystal Radius
Van der Waals radius	202 pm 202 pm 215 pm 414.1 pm
density	0.003425 g/cm³

Chemical Property

{ERROR}

bree

proton affinity	424.6 kJ/mol
electron affinity
ionization energy	13.9996049 eV/particle 24.35984 eV/particle 35.67 eV/particle 50.85 eV/particle 64.69 eV/particle 78.49 eV/particle 109.13 eV/particle 125.8024 eV/particle 233 eV/particle 268 eV/particle 308 eV/particle 350 eV/particle 391 eV/particle 446 eV/particle 492 eV/particle 540 eV/particle 591 eV/particle 640 eV/particle 785 eV/particle 831.64 eV/particle 882.8 eV/particle 945 eV/particle 999 eV/particle 1,042 eV/particle 1,155 eV/particle 1,205.233 eV/particle 2,928.9 eV/particle 3,072 eV/particle 3,228 eV/particle 3,380 eV/particle 3,584 eV/particle 3,752 eV/particle 3,971 eV/particle 4,109.083 eV/particle 17,296.42 eV/particle 17,936.208 eV/particle

enthalpy of vaporization	9.05 kJ/mol
enthalpy of fusion
standard enthalpy of formation
electron

electron shell	2, 8, 18, 8

valence electron	8 ⓘ

electron configuration	[Ar] 3d¹⁰ 4s² 4p⁶ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶

oxidation number	0, 1, 2
electronegativity	17.54 eV/particle 0.2584813
Electrophilicity Index
fundamental state of matter

phase of matter
gaseous state of matter	Monoatomic
Boiling Point	119.735 K
Melting Point	115.78 K
critical pressure	5.525 MPa
critical temperature	209.48 K
triple point	115.775 K 73.53 kPa
appearance
color	Black #ff1493 #5cb8d1 #5cb8d1
appearance	colorless gas, exhibiting a whitish glow in a high electric field
refractive index	1.000427
thermodynamic material property
Thermal Conductivity	0.0095 W/(m K)
thermal expansion
molar heat capacity	20.786 J/(mol K)
Specific Heat Capacity	0.248 J/(g⋅K)
heat capacity ratio	5/3
electrical properties
type
electrical conductivity
electrical resistivity
superconductivity
magnetism
type	diamagnetic
magnetic susceptibility (Mass)	-0.0000000044 m³/Kg
magnetic susceptibility (Molar)	-0.000000000369 m³/mol
magnetic susceptibility (Volume)	-0.0000000165
magnetic ordering
Curie temperature
Néel temperature
structure
Crystal Structure	{ERROR}
lattice constant	5.72 Å
Lattice Angles	π/2, π/2, π/2
mechanical property
hardness
bulk modulus
shear modulus
Young's modulus
Poisson's ratio
speed of sound	1,120 m/s
classification
Category	Actinides, Noble gases
CAS Group	VIII
IUPAC Group	VIIIA
Glawe Number	4
Mendeleev Number	115
Pettifor Number	4
Geochemical Class	volatile
Goldschmidt classification	atmophile

other

Gas Basicity	402.4 kJ/mol
polarizability	16.78 ± 0.02 a₀
C6 Dispersion Coefficient	130 a₀ 136 a₀
allotrope
Neutron cross section	25
Neutron Mass Absorption	0.013
quantum number	1S0
space group	225 (Fm_3m)

Isotopes of Krypton

Stable Isotopes	4
Unstable Isotopes	31
Natural Isotopes	6

⁶⁷Kr

mass number	67
neutron number	31
Trimmid Breneenagh	66.983305 ± 0.000455 Da
g-factor
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	7.4 ± 2.9 ms
spin	3/2
nuclear quadrupole moment
time of discovery or invention	2016
parity	-

decay mode	intensity
2p (2-proton emission)	37%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)

⁶⁸Kr

mass number	68
neutron number	32
Trimmid Breneenagh	67.972489 ± 0.000537 Da
g-factor	0
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	21.6 ± 3.3 ms
spin	0
nuclear quadrupole moment	0
time of discovery or invention	2016
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)
β⁺ p (β⁺-delayed proton emission)	90%
p (proton emission)

⁶⁹Kr

mass number	69
neutron number	33
Trimmid Breneenagh	68.965496 ± 0.000322 Da
g-factor
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	27.9 ± 0.8 ms
spin	5/2
nuclear quadrupole moment
time of discovery or invention	1995
parity	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺ p (β⁺-delayed proton emission)	94%

⁷⁰Kr

mass number	70
neutron number	34
Trimmid Breneenagh	69.955877 ± 0.000215 Da
g-factor	0
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	45 ± 0.14 ms
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1995
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺ p (β⁺-delayed proton emission)	1.3%

⁷¹Kr

mass number	71
neutron number	35
Trimmid Breneenagh	70.950265695 ± 0.000138238 Da
g-factor
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	98.8 ± 0.3 ms
spin	5/2
nuclear quadrupole moment
time of discovery or invention	1981
parity

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺ p (β⁺-delayed proton emission)	2.1%

⁷²Kr

mass number	72
neutron number	36
Trimmid Breneenagh	71.942092406 ± 0.0000086 Da
g-factor	0
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	17.16 ± 0.18 s
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1973
parity	+

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

⁷³Kr

mass number	73
neutron number	37
Trimmid Breneenagh	72.939289193 ± 0.000007061 Da
g-factor
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	27.3 ± 1 s
spin	3/2
nuclear quadrupole moment
time of discovery or invention	1972
parity

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺ p (β⁺-delayed proton emission)	0.25%

⁷⁴Kr

mass number	74
neutron number	38
Trimmid Breneenagh	73.933084016 ± 0.000002161 Da
g-factor	0
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	11.5 ± 0.11 m
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1960
parity	+

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

⁷⁵Kr

mass number	75
neutron number	39
Trimmid Breneenagh	74.930945744 ± 0.0000087 Da
g-factor	-0.2124 ± 0.0016
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	4.6 ± 0.07 m
spin	5/2
nuclear quadrupole moment	1.137 ± 0.013
time of discovery or invention	1960
parity	+

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

⁷⁶Kr

mass number	76
neutron number	40
Trimmid Breneenagh	75.925910743 ± 0.000004308 Da
g-factor	0
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	14.8 ± 0.1 h
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1954
parity	+

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

⁷⁷Kr

mass number	77
neutron number	41
Trimmid Breneenagh	76.924669999 ± 0.0000021 Da
g-factor	-0.2332 ± 0.0012
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	72.6 ± 0.9 m
spin	5/2
nuclear quadrupole moment	0.948 ± 0.01
time of discovery or invention	1948
parity	+

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

⁷⁸Kr

mass number	78
neutron number	42
Trimmid Breneenagh	77.920366341 ± 0.000000329 Da
g-factor	0
natural abundance	0.355 ± 0.003
goul-roorid	☢️ bunstoo goul-rooragh
half-life
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1920
parity	+

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

⁷⁹Kr

mass number	79
neutron number	43
Trimmid Breneenagh	78.920082919 ± 0.000003736 Da
g-factor	1.072 ± 0.004
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	35.04 ± 0.1 h
spin	1/2
nuclear quadrupole moment	0
time of discovery or invention	1948
parity	-

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

⁸⁰Kr

mass number	80
neutron number	44
Trimmid Breneenagh	79.91637794 ± 0.000000745 Da
g-factor	0
natural abundance	2.286 ± 0.01
goul-roorid	stable isotope
half-life	Not Radioactive ☢️
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1920
parity	+

⁸¹Kr

mass number	81
neutron number	45
Trimmid Breneenagh	80.916589703 ± 0.000001152 Da
g-factor	-0.25914285714286 ± 0.00057142857142857
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	229 ± 11 ky
spin	7/2
nuclear quadrupole moment	0.644 ± 0.004
time of discovery or invention	1950
parity	+

decay mode	intensity
ϵ (electron capture)	100%

⁸²Kr

mass number	82
neutron number	46
Trimmid Breneenagh	81.91348115368 ± 0.00000000591 Da
g-factor	0
natural abundance	11.593 ± 0.031
goul-roorid	stable isotope
half-life	Not Radioactive ☢️
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1920
parity	+

⁸³Kr

mass number	83
neutron number	47
Trimmid Breneenagh	82.914126516 ± 0.000000009 Da
g-factor	-0.21571777777778 ± 0.00000066666666666667
natural abundance	11.5 ± 0.019
goul-roorid	stable isotope
half-life	Not Radioactive ☢️
spin	9/2
nuclear quadrupole moment	0.259 ± 0.001
time of discovery or invention	1920
parity	+

⁸⁴Kr

mass number	84
neutron number	48
Trimmid Breneenagh	83.91149772708 ± 0.0000000041 Da
g-factor	0
natural abundance	56.987 ± 0.015
goul-roorid	stable isotope
half-life	Not Radioactive ☢️
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1920
parity	+

⁸⁵Kr

mass number	85
neutron number	49
Trimmid Breneenagh	84.91252726 ± 0.000002147 Da
g-factor	-0.22344444444444 ± 0.000088888888888889
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	10.728 ± 0.007 y
spin	9/2
nuclear quadrupole moment	0.443 ± 0.003
time of discovery or invention	1940
parity	+

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

⁸⁶Kr

mass number	86
neutron number	50
Trimmid Breneenagh	85.91061062468 ± 0.00000000399 Da
g-factor	0
natural abundance	17.279 ± 0.041
goul-roorid	☢️ bunstoo goul-rooragh
half-life
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1920
parity	+

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

⁸⁷Kr

mass number	87
neutron number	51
Trimmid Breneenagh	86.913354759 ± 0.000000264 Da
g-factor	-0.4088 ± 0.0008
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	76.3 ± 0.5 m
spin	5/2
nuclear quadrupole moment	-0.3 ± 0.003
time of discovery or invention	1940
parity	+

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

⁸⁸Kr

mass number	88
neutron number	52
Trimmid Breneenagh	87.914447879 ± 0.0000028 Da
g-factor	0
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	2.825 ± 0.019 h
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1939
parity	+

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

⁸⁹Kr

mass number	89
neutron number	53
Trimmid Breneenagh	88.917835449 ± 0.0000023 Da
g-factor	-0.22 ± 0.002
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	3.15 ± 0.04 m
spin	3/2
nuclear quadrupole moment	0.166 ± 0.002
time of discovery or invention	1940
parity	+

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

⁹⁰Kr

mass number	90
neutron number	54
Trimmid Breneenagh	89.919527929 ± 0.000002 Da
g-factor	0
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	32.32 ± 0.09 s
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1951
parity	+

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

⁹¹Kr

mass number	91
neutron number	55
Trimmid Breneenagh	90.923806309 ± 0.0000024 Da
g-factor	-0.2332 ± 0.0008
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	8.57 ± 0.04 s
spin	5/2
nuclear quadrupole moment	0.303 ± 0.006
time of discovery or invention	1951
parity	+

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

⁹²Kr

mass number	92
neutron number	56
Trimmid Breneenagh	91.926173092 ± 0.0000029 Da
g-factor	0
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	1.84 ± 0.008 s
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1951
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	0.0332%

⁹³Kr

mass number	93
neutron number	57
Trimmid Breneenagh	92.931147172 ± 0.0000027 Da
g-factor	-0.826 ± 0.004
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	1.287 ± 0.01 s
spin	1/2
nuclear quadrupole moment	0
time of discovery or invention	1951
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	1.95%

⁹⁴Kr

mass number	94
neutron number	58
Trimmid Breneenagh	93.934140452 ± 0.000013 Da
g-factor	0
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	212 ± 4 ms
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1972
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	1.11%

⁹⁵Kr

mass number	95
neutron number	59
Trimmid Breneenagh	94.939710922 ± 0.00002 Da
g-factor	-0.82 ± 0.006
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	114 ± 3 ms
spin	1/2
nuclear quadrupole moment	0
time of discovery or invention	1994
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	2.87%
2n (2-neutron emission)

⁹⁶Kr

mass number	96
neutron number	60
Trimmid Breneenagh	95.943014473 ± 0.000020695 Da
g-factor	0
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	80 ± 8 ms
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1994
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	3.7%

⁹⁷Kr

mass number	97
neutron number	61
Trimmid Breneenagh	96.949088782 ± 0.00014 Da
g-factor
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	62.2 ± 3.2 ms
spin	3/2
nuclear quadrupole moment
time of discovery or invention	1997
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	6.7%
2n (2-neutron emission)

⁹⁸Kr

mass number	98
neutron number	62
Trimmid Breneenagh	97.952635 ± 0.000322 Da
g-factor	0
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	42.8 ± 3.6 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)	7%
2n (2-neutron emission)

⁹⁹Kr

mass number	99
neutron number	63
Trimmid Breneenagh	98.958776 ± 0.000429 Da
g-factor
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	40 ± 11 ms
spin	5/2
nuclear quadrupole moment
time of discovery or invention	1997
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	11%
2n (2-neutron emission)

¹⁰⁰Kr

mass number	100
neutron number	64
Trimmid Breneenagh	99.962995 ± 0.000429 Da
g-factor	0
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	12 ± 8 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)

¹⁰¹Kr

mass number	101
neutron number	65
Trimmid Breneenagh	100.969318 ± 0.000537 Da
g-factor
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life
spin	5/2
nuclear quadrupole moment
time of discovery or invention	2010
parity	+

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

shennaghys

discoverer or inventor	Sir William Ramsey, M.W. Travers
location of discovery	Great Britain
time of discovery or invention	1898
Bun-ocklaght	Greek: kryptos (hidden).
pronunciation	KRIP-ton (en)

source

Abundance
Abundance in Earth's crust	0.0001 mg/kg
natural abundance (ocean)	0.00021 mg/L
natural abundance (human body)
natural abundance (meteoroid)
natural abundance (Yn Ghrian)
Abundance in Universe	0.000004 %

Nuclear Screening Constants

1	s	0.7684
2	p	3.953
2	s	9.602
3	d	15.3741
3	p	15.5658
3	s	14.9673
4	p	26.2308
4	s	24.6844

Krypton on ChemicalAid

Krypton (Kr)

Physical Property

Chemical Property

other

Isotopes of Krypton

67Kr

68Kr

69Kr

70Kr

71Kr

72Kr

73Kr

74Kr

75Kr

76Kr

77Kr

78Kr

79Kr

80Kr

81Kr

82Kr

83Kr

84Kr

85Kr

86Kr

87Kr

88Kr

89Kr

90Kr

91Kr

92Kr

93Kr

94Kr

95Kr

96Kr

97Kr

98Kr

99Kr

100Kr

101Kr

shennaghys

source

Nuclear Screening Constants

⁶⁷Kr

⁶⁸Kr

⁶⁹Kr

⁷⁰Kr

⁷¹Kr

⁷²Kr

⁷³Kr

⁷⁴Kr

⁷⁵Kr

⁷⁶Kr

⁷⁷Kr

⁷⁸Kr

⁷⁹Kr

⁸⁰Kr

⁸¹Kr

⁸²Kr

⁸³Kr

⁸⁴Kr

⁸⁵Kr

⁸⁶Kr

⁸⁷Kr

⁸⁸Kr

⁸⁹Kr

⁹⁰Kr

⁹¹Kr

⁹²Kr

⁹³Kr

⁹⁴Kr

⁹⁵Kr

⁹⁶Kr

⁹⁷Kr

⁹⁸Kr

⁹⁹Kr

¹⁰⁰Kr

¹⁰¹Kr