سېلېن

سېلېن (Se)

chemical element with symbol Se and atomic number 34
Atomic Number34
Atomic Weight78.971
mass number80
Group16
Period4
Blockp
پروتون34 p+
neutron46 n0
ئېلېكترون34 e-
Animated بورمودىلى of Se (سېلېن)

Physical Property

Atomic Radius
molar volume
covalent radius
Metallic Radius
ionic radius
Crystal Radius
Van der Waals radius
density
Atomic Radii Of The Elements: سېلېن0102030405060708090100110120130140150160170180190pmAtomic RadiusCovalent RadiusMetallic RadiusVan der Waals radius

Chemical Property

ئېنېرگىيە
proton affinity
electron affinity
ionization energy
ionization energy of Se (سېلېن)
enthalpy of vaporization
enthalpy of fusion
standard enthalpy of formation
ئېلېكترون
ئېلېكترون قەۋەت2, 8, 18, 6
بورمودىلى: Se (سېلېن)
valence electron6
Lewis structure: Se (سېلېن)
electron configuration[Ar] 3d10 4s2 4p4
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4
Enhanced بورمودىلى of Se (سېلېن)
Orbital Diagram of Se (سېلېن)
oxidation number-2, -1, 0, 1, 2, 3, 4, 5, 6
electronegativity
2.55
Electrophilicity Index
fundamental state of matter
phase of matterSolid
gaseous state of matter
Boiling Point
Melting Point
critical pressure
critical temperature
triple point
appearance
color
Gray
appearanceblack, red, and gray (not pictured) allotropes
refractive index
1.000895
thermodynamic material property
Thermal Conductivity
thermal expansion
molar heat capacity
Specific Heat Capacity
heat capacity ratio
electrical properties
type
electrical conductivity
electrical resistivity
superconductivity
magnetism
typediamagnetic
magnetic susceptibility (Mass)
-0.000000004 m³/Kg
magnetic susceptibility (Molar)
-0.000000000316 m³/mol
magnetic susceptibility (Volume)
-0.0000193
magnetic ordering
Curie temperature
Néel temperature
structure
Crystal StructureSimple Monoclinic (HEX)
lattice constant
Lattice Anglesπ/2, 1.58493, π/2
mechanical property
hardness
bulk modulus
shear modulus
Young's modulus
Poisson's ratio
0.33
speed of sound
classification
CategoryOther nonmetals, Nonmetals
CAS GroupVIB
IUPAC GroupVIA
Glawe Number95
Mendeleev Number101
Pettifor Number93
Geochemical Classsemi-volatile
Goldschmidt classificationchalcophile

other

Gas Basicity
polarizability
C6 Dispersion Coefficient
allotropeAmorphous Red Selenium, Amorphous Black Selenium, Monoclinic Selenium, Hexagonal Selenium
Neutron cross section
11.7
Neutron Mass Absorption
0.0056
quantum number3P2
space group14 (P121/c1)

Isotopes of Selenium

Stable Isotopes3
Unstable Isotopes30
Natural Isotopes6
Isotopic Composition8049.80%8049.80%7823.69%7823.69%769.23%769.23%828.82%828.82%777.60%777.60%740.86%740.86%

63Se

mass number63
neutron number29
Relative Atomic Mass
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
13.2 ± 3.9 ms
spin3/2
nuclear quadrupole moment
time of discovery or invention2016
parity-

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)100%
β+ p (β+-delayed proton emission)89%
2p (2-proton emission)0.5%

64Se

mass number64
neutron number30
Relative Atomic Mass
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
22.6 ± 0.2 ms
spin0
nuclear quadrupole moment
0
time of discovery or invention2005
parity+

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

65Se

mass number65
neutron number31
Relative Atomic Mass
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
34.2 ± 0.7 ms
spin3/2
nuclear quadrupole moment
time of discovery or invention1993
parity-

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)100%
β+ p (β+-delayed proton emission)87%

66Se

mass number66
neutron number32
Relative Atomic Mass
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
54 ± 4 ms
spin0
nuclear quadrupole moment
0
time of discovery or invention1993
parity+

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

67Se

mass number67
neutron number33
Relative Atomic Mass
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
133 ± 4 ms
spin5/2
nuclear quadrupole moment
time of discovery or invention1991
parity-

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)100%
β+ p (β+-delayed proton emission)0.5%

68Se

mass number68
neutron number34
Relative Atomic Mass
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
35.5 ± 0.7 s
spin0
nuclear quadrupole moment
0
time of discovery or invention1990
parity+

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

69Se

mass number69
neutron number35
Relative Atomic Mass
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
27.4 ± 0.2 s
spin1/2
nuclear quadrupole moment
0
time of discovery or invention1974
parity-

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)100%
β+ p (β+-delayed proton emission)0.052%

70Se

mass number70
neutron number36
Relative Atomic Mass
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
41.1 ± 0.3 m
spin0
nuclear quadrupole moment
0
time of discovery or invention1950
parity+

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

71Se

mass number71
neutron number37
Relative Atomic Mass
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
4.74 ± 0.05 m
spin5/2
nuclear quadrupole moment
time of discovery or invention1957
parity-

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

72Se

mass number72
neutron number38
Relative Atomic Mass
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
8.4 ± 0.08 d
spin0
nuclear quadrupole moment
0
time of discovery or invention1948
parity+

decay modeintensity
ϵ (electron capture)100%

73Se

mass number73
neutron number39
Relative Atomic Mass
g-factor
0.19822222222222 ± 0.0028888888888889
natural abundance
radioactivity☢️ radioactive element
half-life
7.15 ± 0.09 h
spin9/2
nuclear quadrupole moment
time of discovery or invention1948
parity+

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

74Se

mass number74
neutron number40
Relative Atomic Mass
g-factor
0
natural abundance
0.86 ± 0.03
radioactivity☢️ radioactive element
half-life
spin0
nuclear quadrupole moment
0
time of discovery or invention1922
parity+

decay modeintensity
+ (double β+ decay)

75Se

mass number75
neutron number41
Relative Atomic Mass
g-factor
0.2732 ± 0.004
natural abundance
radioactivity☢️ radioactive element
half-life
119.78 ± 0.03 d
spin5/2
nuclear quadrupole moment
1.1 ± 0.2
time of discovery or invention1947
parity+

decay modeintensity
ϵ (electron capture)100%

76Se

mass number76
neutron number42
Relative Atomic Mass
g-factor
0
natural abundance
9.23 ± 0.07
radioactivitystable isotope
half-lifeNot Radioactive ☢️
spin0
nuclear quadrupole moment
0
time of discovery or invention1922
parity+

77Se

mass number77
neutron number43
Relative Atomic Mass
g-factor
1.06712 ± 0.0001
natural abundance
7.6 ± 0.07
radioactivitystable isotope
half-lifeNot Radioactive ☢️
spin1/2
nuclear quadrupole moment
0
time of discovery or invention1922
parity-

78Se

mass number78
neutron number44
Relative Atomic Mass
g-factor
0
natural abundance
23.69 ± 0.22
radioactivitystable isotope
half-lifeNot Radioactive ☢️
spin0
nuclear quadrupole moment
0
time of discovery or invention1922
parity+

79Se

mass number79
neutron number45
Relative Atomic Mass
g-factor
-0.29085714285714 ± 0.0042857142857143
natural abundance
radioactivity☢️ radioactive element
half-life
327 ± 28 ky
spin7/2
nuclear quadrupole moment
0.8 ± 0.2
time of discovery or invention1950
parity+

decay modeintensity
β (β decay)100%

80Se

mass number80
neutron number46
Relative Atomic Mass
g-factor
0
natural abundance
49.8 ± 0.36
radioactivity☢️ radioactive element
half-life
spin0
nuclear quadrupole moment
0
time of discovery or invention1922
parity+

decay modeintensity
(double β decay)

81Se

mass number81
neutron number47
Relative Atomic Mass
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
18.45 ± 0.12 m
spin1/2
nuclear quadrupole moment
0
time of discovery or invention1948
parity-

decay modeintensity
β (β decay)100%

82Se

mass number82
neutron number48
Relative Atomic Mass
g-factor
0
natural abundance
8.82 ± 0.15
radioactivity☢️ radioactive element
half-life
87.6 ± 1.5 Ey
spin0
nuclear quadrupole moment
0
time of discovery or invention1922
parity+

decay modeintensity
(double β decay)100%

83Se

mass number83
neutron number49
Relative Atomic Mass
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
22.25 ± 0.04 m
spin9/2
nuclear quadrupole moment
time of discovery or invention1937
parity+

decay modeintensity
β (β decay)100%

84Se

mass number84
neutron number50
Relative Atomic Mass
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
3.26 ± 0.1 m
spin0
nuclear quadrupole moment
0
time of discovery or invention1960
parity+

decay modeintensity
β (β decay)100%

85Se

mass number85
neutron number51
Relative Atomic Mass
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
32.9 ± 0.3 s
spin5/2
nuclear quadrupole moment
time of discovery or invention1960
parity

decay modeintensity
β (β decay)100%

86Se

mass number86
neutron number52
Relative Atomic Mass
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
14.3 ± 0.3 s
spin0
nuclear quadrupole moment
0
time of discovery or invention1973
parity+

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

87Se

mass number87
neutron number53
Relative Atomic Mass
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
5.5 ± 0.06 s
spin3/2
nuclear quadrupole moment
time of discovery or invention1968
parity+

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)0.6%

88Se

mass number88
neutron number54
Relative Atomic Mass
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
1.53 ± 0.06 s
spin0
nuclear quadrupole moment
0
time of discovery or invention1970
parity+

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)0.99%

89Se

mass number89
neutron number55
Relative Atomic Mass
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
430 ± 50 ms
spin5/2
nuclear quadrupole moment
time of discovery or invention1971
parity+

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)7.8%

90Se

mass number90
neutron number56
Relative Atomic Mass
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
210 ± 80 ms
spin0
nuclear quadrupole moment
0
time of discovery or invention1994
parity+

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

91Se

mass number91
neutron number57
Relative Atomic Mass
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
270 ± 50 ms
spin1/2
nuclear quadrupole moment
0
time of discovery or invention1975
parity+

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)21%
2n (2-neutron emission)

92Se

mass number92
neutron number58
Relative Atomic Mass
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
spin0
nuclear quadrupole moment
0
time of discovery or invention1997
parity+

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

93Se

mass number93
neutron number59
Relative Atomic Mass
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
spin1/2
nuclear quadrupole moment
0
time of discovery or invention1997
parity+

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

94Se

mass number94
neutron number60
Relative Atomic Mass
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
spin0
nuclear quadrupole moment
0
time of discovery or invention1997
parity+

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

95Se

mass number95
neutron number61
Relative Atomic Mass
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
spin3/2
nuclear quadrupole moment
time of discovery or invention2010
parity+

decay modeintensity
β (β decay)
β n (β-delayed neutron emission)
2n (2-neutron emission)
Selen 1

تارىخ

discoverer or inventorJöns Berzelius
location of discoverySweden
time of discovery or invention1818
etymologyGreek: selênê (moon).
pronunciationsi-LEE-ni-em (ئىنگلىزچە)

source

Abundance
Abundance in Earth's crust
natural abundance (ئوكيانىيە)
natural abundance (human body)
0.000005 %
natural abundance (meteoroid)
0.0013 %
natural abundance (قۇياش)
Abundance in Universe
0.000003 %

Nuclear Screening Constants

1s0.7378
2p3.9348
2s9.1116
3d15.523
3p15.295
3s14.5966
4p25.7128
4s24.2424