Selenyûm

Selenyûm (Se)

chemical element with symbol Se and atomic number 34
Atomic Number34
Atomic Weight78.971
Hejmara baristeyî80
Group16
Period4
Blockp
Proton34 p+
Notron46 n0
Kareva34 e-
Animated Bohr model of Se (Selenyûm)

Physical Property

Atomic Radius
115 pm
molar volume
Covalent Radius
116 pm
Metallic Radius
117 pm
ionic radius
198 pm
Crystal Radius
184 pm
Van der Waals radius
190 pm
density
4,809 g/cm³
Atomic Radii Of The Elements: Selenyûm0102030405060708090100110120130140150160170180190pmAtomic RadiusCovalent RadiusMetallic RadiusVan der Waals radius

Chemical Property

wize
proton affinity
electron affinity
2,02067 eV/particle
ionization energy
9,752392 eV/particle
ionization energy of Se (Selenyûm)
enthalpy of vaporization
59,7 kJ/mol
enthalpy of fusion
5,23 kJ/mol
standard enthalpy of formation
227,2 kJ/mol
Kareva
electron shell2, 8, 18, 6
Bohr model: Se (Selenyûm)
valence electron6
Lewis structure: Se (Selenyûm)
electron configuration[Ar] 3d10 4s2 4p4
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4
Enhanced Bohr model of Se (Selenyûm)
Orbital Diagram of Se (Selenyûm)
oxidation number-2, -1, 0, 1, 2, 3, 4, 5, 6
electronegativity
2.55
Electrophilicity Index
2,2408492709619536 eV/particle
fundamental state of matter
phase of matterSolid
gaseous state of matter
Boiling Point
958,15 K
Melting Point
453,15 K
critical pressure
critical temperature
1.766,15 K
triple point
appearance
color
Gray
appearanceblack, red, and gray (not pictured) allotropes
refractive index
1,000895
thermodynamic material property
Thermal Conductivity
0,52 W/(m K)
thermal expansion
molar heat capacity
25,363 J/(mol K)
Specific Heat Capacity
0,321 J/(g⋅K)
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
Germahiya Curie
Néel temperature
pêkhate
Crystal StructureSimple Monoclinic (HEX)
lattice constant
4,36 Å
Lattice Anglesπ/2, 1.58493, π/2
mechanical property
hardness
2 MPa
bulk modulus
8,3 GPa
shear modulus
3,7 GPa
Young's modulus
10 GPa
Poisson's ratio
0,33
Leza dengê
3.350 m/s
classification
CategoryOther nonmetals, Nonmetals
CAS GroupVIB
IUPAC GroupVIA
Glawe Number95
Mendeleev Number101
Pettifor Number93
Geochemical Classsemi-volatile
Goldschmidt classificationchalcophile

other

Gas Basicity
polarizability
28,9 ± 1 a₀
C6 Dispersion Coefficient
210 a₀
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

Hejmara baristeyî63
neutron number29
Giraniya atomê
62,981911 ± 0,000537 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
13,2 ± 3,9 ms
spin3/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê2016
parity-

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

64Se

Hejmara baristeyî64
neutron number30
Giraniya atomê
63,971165 ± 0,000537 Da
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
22,6 ± 0,2 ms
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê2005
parity+

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

65Se

Hejmara baristeyî65
neutron number31
Giraniya atomê
64,964552 ± 0,000322 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
34,2 ± 0,7 ms
spin3/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê1993
parity-

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

66Se

Hejmara baristeyî66
neutron number32
Giraniya atomê
65,955276 ± 0,000215 Da
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
54 ± 4 ms
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1993
parity+

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

67Se

Hejmara baristeyî67
neutron number33
Giraniya atomê
66,949994 ± 0,000072 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
133 ± 4 ms
spin5/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê1991
parity-

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

68Se

Hejmara baristeyî68
neutron number34
Giraniya atomê
67,941825236 ± 0,000000532 Da
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
35,5 ± 0,7 s
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1990
parity+

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

69Se

Hejmara baristeyî69
neutron number35
Giraniya atomê
68,939414845 ± 0,000001599 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
27,4 ± 0,2 s
spin1/2
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1974
parity-

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

70Se

Hejmara baristeyî70
neutron number36
Giraniya atomê
69,933515521 ± 0,0000017 Da
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
41,1 ± 0,3 m
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1950
parity+

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

71Se

Hejmara baristeyî71
neutron number37
Giraniya atomê
70,932209431 ± 0,000003 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
4,74 ± 0,05 m
spin5/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê1957
parity-

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

72Se

Hejmara baristeyî72
neutron number38
Giraniya atomê
71,927140506 ± 0,0000021 Da
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
8,4 ± 0,08 d
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1948
parity+

decay modeintensity
ϵ (electron capture)100%

73Se

Hejmara baristeyî73
neutron number39
Giraniya atomê
72,926754881 ± 0,000007969 Da
g-factor
0,19822222222222 ± 0,0028888888888889
natural abundance
radioactivity☢️ radioactive element
half-life
7,15 ± 0,09 h
spin9/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê1948
parity+

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

74Se

Hejmara baristeyî74
neutron number40
Giraniya atomê
73,922475933 ± 0,000000015 Da
g-factor
0
natural abundance
0,86 ± 0,03
radioactivity☢️ radioactive element
half-life
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1922
parity+

decay modeintensity
+ (double β+ decay)

75Se

Hejmara baristeyî75
neutron number41
Giraniya atomê
74,92252287 ± 0,000000078 Da
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
dema îcadkirinê yan keşfê1947
parity+

decay modeintensity
ϵ (electron capture)100%

76Se

Hejmara baristeyî76
neutron number42
Giraniya atomê
75,919213702 ± 0,000000017 Da
g-factor
0
natural abundance
9,23 ± 0,07
radioactivitystable isotope
half-lifeNot Radioactive ☢️
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1922
parity+

77Se

Hejmara baristeyî77
neutron number43
Giraniya atomê
76,91991415 ± 0,000000067 Da
g-factor
1,06712 ± 0,0001
natural abundance
7,6 ± 0,07
radioactivitystable isotope
half-lifeNot Radioactive ☢️
spin1/2
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1922
parity-

78Se

Hejmara baristeyî78
neutron number44
Giraniya atomê
77,917309244 ± 0,000000191 Da
g-factor
0
natural abundance
23,69 ± 0,22
radioactivitystable isotope
half-lifeNot Radioactive ☢️
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1922
parity+

79Se

Hejmara baristeyî79
neutron number45
Giraniya atomê
78,918499252 ± 0,000000238 Da
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
dema îcadkirinê yan keşfê1950
parity+

decay modeintensity
β (β decay)100%

80Se

Hejmara baristeyî80
neutron number46
Giraniya atomê
79,916521761 ± 0,000001016 Da
g-factor
0
natural abundance
49,8 ± 0,36
radioactivity☢️ radioactive element
half-life
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1922
parity+

decay modeintensity
(double β decay)

81Se

Hejmara baristeyî81
neutron number47
Giraniya atomê
80,917993019 ± 0,000001049 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
18,45 ± 0,12 m
spin1/2
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1948
parity-

decay modeintensity
β (β decay)100%

82Se

Hejmara baristeyî82
neutron number48
Giraniya atomê
81,916699531 ± 0,0000005 Da
g-factor
0
natural abundance
8,82 ± 0,15
radioactivity☢️ radioactive element
half-life
87,6 ± 1,5 Ey
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1922
parity+

decay modeintensity
(double β decay)100%

83Se

Hejmara baristeyî83
neutron number49
Giraniya atomê
82,919118604 ± 0,000003259 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
22,25 ± 0,04 m
spin9/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê1937
parity+

decay modeintensity
β (β decay)100%

84Se

Hejmara baristeyî84
neutron number50
Giraniya atomê
83,918466761 ± 0,000002105 Da
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
3,26 ± 0,1 m
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1960
parity+

decay modeintensity
β (β decay)100%

85Se

Hejmara baristeyî85
neutron number51
Giraniya atomê
84,922260758 ± 0,000002804 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
32,9 ± 0,3 s
spin5/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê1960
parity

decay modeintensity
β (β decay)100%

86Se

Hejmara baristeyî86
neutron number52
Giraniya atomê
85,924311732 ± 0,000002705 Da
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
14,3 ± 0,3 s
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1973
parity+

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

87Se

Hejmara baristeyî87
neutron number53
Giraniya atomê
86,928688616 ± 0,000002405 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
5,5 ± 0,06 s
spin3/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê1968
parity+

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

88Se

Hejmara baristeyî88
neutron number54
Giraniya atomê
87,93141749 ± 0,000003604 Da
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
1,53 ± 0,06 s
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1970
parity+

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

89Se

Hejmara baristeyî89
neutron number55
Giraniya atomê
88,936669058 ± 0,000004003 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
430 ± 50 ms
spin5/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê1971
parity+

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

90Se

Hejmara baristeyî90
neutron number56
Giraniya atomê
89,940096 ± 0,000354 Da
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
210 ± 80 ms
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1994
parity+

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

91Se

Hejmara baristeyî91
neutron number57
Giraniya atomê
90,9457 ± 0,000465 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
270 ± 50 ms
spin1/2
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1975
parity+

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

92Se

Hejmara baristeyî92
neutron number58
Giraniya atomê
91,94984 ± 0,000429 Da
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1997
parity+

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

93Se

Hejmara baristeyî93
neutron number59
Giraniya atomê
92,956135 ± 0,000429 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
spin1/2
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1997
parity+

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

94Se

Hejmara baristeyî94
neutron number60
Giraniya atomê
93,96049 ± 0,000537 Da
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1997
parity+

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

95Se

Hejmara baristeyî95
neutron number61
Giraniya atomê
94,9673 ± 0,000537 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
spin3/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê2010
parity+

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

dîrok

kaşîf an îcadkerJöns Berzelius
location of discoverySweden
dema îcadkirinê yan keşfê1818
BêjenasîGreek: selênê (moon).
pronunciationsi-LEE-ni-em (îngilîzî)

source

Abundance
Abundance in Earth's crust
0,05 mg/kg
natural abundance (Okyanûs)
0,0002 mg/L
natural abundance (human body)
0,000005 %
natural abundance (meteoroid)
0,0013 %
natural abundance (Roj)
Abundance in Universe
0,000003 %

Nuclear Screening Constants

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