Selenium

Selenium (Se)

chemical element with symbol Se and atomic number 34
Atomic Number34
Atomic Weight78.971
Massagetal80
Group16
Period4
Blockp
proton34 p+
neutron46 n0
elektron34 e-
Animated Bohr model of Se (Selenium)

Physical Property

Atoomradius
115 pm
molar volume
Covalent Radius
116 pm
Metallic Radius
117 pm
Ioonradius
198 pm
Crystal Radius
184 pm
Van der Waals radius
190 pm
density
4,809 g/cm³
Atomic Radii Of The Elements: Selenium020406080100120140160180200pmAtoomradiusCovalent RadiusMetallic RadiusVan der Waals radius

Chemical Property

energie
proton affinity
electron affinity
2,02067 eV/particle
ionization energy
9,752392 eV/particle
ionization energy of Se (Selenium)
Verdampingswarmte
59,7 kJ/mol
smeltingswarmte
5,23 kJ/mol
Vormingsentalpie
227,2 kJ/mol
elektron
Elektronskil2, 8, 18, 6
Bohr model: Se (Selenium)
Valenselektrone6
Lewisteorie: Se (Selenium)
elektronkonfigurasie[Ar] 3d10 4s2 4p4
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4
Enhanced Bohr model of Se (Selenium)
Orbital Diagram of Se (Selenium)
Oksidasietoestand-2, -1, 0, 1, 2, 3, 4, 5, 6
Elektronegatiwiteit
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
kleur
Gray
appearanceblack, red, and gray (not pictured) allotropes
Brekingsindeks
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
Geleidingsvermoë
Elektriese resistiwiteit
superconductivity
Magnetisme
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
4,36 Å
Lattice Anglesπ/2, 1.58493, π/2
mechanical property
hardness
2 MPa
Massamodulus
8,3 GPa
Skuifmodulus
3,7 GPa
Young se modulus
10 GPa
Poisson se verhouding
0,33
Spoed van klank
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
Ruimtegroep14 (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

Massagetal63
neutron number29
relative atomic mass
62,981911 ± 0,000537 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
13,2 ± 3,9 ms
spin3/2
nuclear quadrupole moment
ontdekkingsdatum2016
parity-

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

64Se

Massagetal64
neutron number30
relative atomic mass
63,971165 ± 0,000537 Da
g-factor
0
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
22,6 ± 0,2 ms
spin0
nuclear quadrupole moment
0
ontdekkingsdatum2005
parity+

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

65Se

Massagetal65
neutron number31
relative atomic mass
64,964552 ± 0,000322 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
34,2 ± 0,7 ms
spin3/2
nuclear quadrupole moment
ontdekkingsdatum1993
parity-

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

66Se

Massagetal66
neutron number32
relative atomic mass
65,955276 ± 0,000215 Da
g-factor
0
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
54 ± 4 ms
spin0
nuclear quadrupole moment
0
ontdekkingsdatum1993
parity+

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

67Se

Massagetal67
neutron number33
relative atomic mass
66,949994 ± 0,000072 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
133 ± 4 ms
spin5/2
nuclear quadrupole moment
ontdekkingsdatum1991
parity-

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

68Se

Massagetal68
neutron number34
relative atomic mass
67,941825236 ± 0,000000532 Da
g-factor
0
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
35,5 ± 0,7 s
spin0
nuclear quadrupole moment
0
ontdekkingsdatum1990
parity+

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

69Se

Massagetal69
neutron number35
relative atomic mass
68,939414845 ± 0,000001599 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
27,4 ± 0,2 s
spin1/2
nuclear quadrupole moment
0
ontdekkingsdatum1974
parity-

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

70Se

Massagetal70
neutron number36
relative atomic mass
69,933515521 ± 0,0000017 Da
g-factor
0
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
41,1 ± 0,3 m
spin0
nuclear quadrupole moment
0
ontdekkingsdatum1950
parity+

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

71Se

Massagetal71
neutron number37
relative atomic mass
70,932209431 ± 0,000003 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
4,74 ± 0,05 m
spin5/2
nuclear quadrupole moment
ontdekkingsdatum1957
parity-

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

72Se

Massagetal72
neutron number38
relative atomic mass
71,927140506 ± 0,0000021 Da
g-factor
0
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
8,4 ± 0,08 d
spin0
nuclear quadrupole moment
0
ontdekkingsdatum1948
parity+

decay modeintensity
ϵ (electron capture)100%

73Se

Massagetal73
neutron number39
relative atomic mass
72,926754881 ± 0,000007969 Da
g-factor
0,19822222222222 ± 0,0028888888888889
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
7,15 ± 0,09 h
spin9/2
nuclear quadrupole moment
ontdekkingsdatum1948
parity+

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

74Se

Massagetal74
neutron number40
relative atomic mass
73,922475933 ± 0,000000015 Da
g-factor
0
natural abundance
0,86 ± 0,03
radioaktiwiteit☢️ radioactive element
Halfleeftyd
spin0
nuclear quadrupole moment
0
ontdekkingsdatum1922
parity+

decay modeintensity
+ (double β+ decay)

75Se

Massagetal75
neutron number41
relative atomic mass
74,92252287 ± 0,000000078 Da
g-factor
0,2732 ± 0,004
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
119,78 ± 0,03 d
spin5/2
nuclear quadrupole moment
1,1 ± 0,2
ontdekkingsdatum1947
parity+

decay modeintensity
ϵ (electron capture)100%

76Se

Massagetal76
neutron number42
relative atomic mass
75,919213702 ± 0,000000017 Da
g-factor
0
natural abundance
9,23 ± 0,07
radioaktiwiteitStabiele isotoop
HalfleeftydNot Radioactive ☢️
spin0
nuclear quadrupole moment
0
ontdekkingsdatum1922
parity+

77Se

Massagetal77
neutron number43
relative atomic mass
76,91991415 ± 0,000000067 Da
g-factor
1,06712 ± 0,0001
natural abundance
7,6 ± 0,07
radioaktiwiteitStabiele isotoop
HalfleeftydNot Radioactive ☢️
spin1/2
nuclear quadrupole moment
0
ontdekkingsdatum1922
parity-

78Se

Massagetal78
neutron number44
relative atomic mass
77,917309244 ± 0,000000191 Da
g-factor
0
natural abundance
23,69 ± 0,22
radioaktiwiteitStabiele isotoop
HalfleeftydNot Radioactive ☢️
spin0
nuclear quadrupole moment
0
ontdekkingsdatum1922
parity+

79Se

Massagetal79
neutron number45
relative atomic mass
78,918499252 ± 0,000000238 Da
g-factor
-0,29085714285714 ± 0,0042857142857143
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
327 ± 28 ky
spin7/2
nuclear quadrupole moment
0,8 ± 0,2
ontdekkingsdatum1950
parity+

decay modeintensity
β (β decay)100%

80Se

Massagetal80
neutron number46
relative atomic mass
79,916521761 ± 0,000001016 Da
g-factor
0
natural abundance
49,8 ± 0,36
radioaktiwiteit☢️ radioactive element
Halfleeftyd
spin0
nuclear quadrupole moment
0
ontdekkingsdatum1922
parity+

decay modeintensity
(double β decay)

81Se

Massagetal81
neutron number47
relative atomic mass
80,917993019 ± 0,000001049 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
18,45 ± 0,12 m
spin1/2
nuclear quadrupole moment
0
ontdekkingsdatum1948
parity-

decay modeintensity
β (β decay)100%

82Se

Massagetal82
neutron number48
relative atomic mass
81,916699531 ± 0,0000005 Da
g-factor
0
natural abundance
8,82 ± 0,15
radioaktiwiteit☢️ radioactive element
Halfleeftyd
87,6 ± 1,5 Ey
spin0
nuclear quadrupole moment
0
ontdekkingsdatum1922
parity+

decay modeintensity
(double β decay)100%

83Se

Massagetal83
neutron number49
relative atomic mass
82,919118604 ± 0,000003259 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
22,25 ± 0,04 m
spin9/2
nuclear quadrupole moment
ontdekkingsdatum1937
parity+

decay modeintensity
β (β decay)100%

84Se

Massagetal84
neutron number50
relative atomic mass
83,918466761 ± 0,000002105 Da
g-factor
0
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
3,26 ± 0,1 m
spin0
nuclear quadrupole moment
0
ontdekkingsdatum1960
parity+

decay modeintensity
β (β decay)100%

85Se

Massagetal85
neutron number51
relative atomic mass
84,922260758 ± 0,000002804 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
32,9 ± 0,3 s
spin5/2
nuclear quadrupole moment
ontdekkingsdatum1960
parity

decay modeintensity
β (β decay)100%

86Se

Massagetal86
neutron number52
relative atomic mass
85,924311732 ± 0,000002705 Da
g-factor
0
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
14,3 ± 0,3 s
spin0
nuclear quadrupole moment
0
ontdekkingsdatum1973
parity+

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

87Se

Massagetal87
neutron number53
relative atomic mass
86,928688616 ± 0,000002405 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
5,5 ± 0,06 s
spin3/2
nuclear quadrupole moment
ontdekkingsdatum1968
parity+

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

88Se

Massagetal88
neutron number54
relative atomic mass
87,93141749 ± 0,000003604 Da
g-factor
0
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
1,53 ± 0,06 s
spin0
nuclear quadrupole moment
0
ontdekkingsdatum1970
parity+

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

89Se

Massagetal89
neutron number55
relative atomic mass
88,936669058 ± 0,000004003 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
430 ± 50 ms
spin5/2
nuclear quadrupole moment
ontdekkingsdatum1971
parity+

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

90Se

Massagetal90
neutron number56
relative atomic mass
89,940096 ± 0,000354 Da
g-factor
0
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
210 ± 80 ms
spin0
nuclear quadrupole moment
0
ontdekkingsdatum1994
parity+

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

91Se

Massagetal91
neutron number57
relative atomic mass
90,9457 ± 0,000465 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
270 ± 50 ms
spin1/2
nuclear quadrupole moment
0
ontdekkingsdatum1975
parity+

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

92Se

Massagetal92
neutron number58
relative atomic mass
91,94984 ± 0,000429 Da
g-factor
0
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
spin0
nuclear quadrupole moment
0
ontdekkingsdatum1997
parity+

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

93Se

Massagetal93
neutron number59
relative atomic mass
92,956135 ± 0,000429 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
spin1/2
nuclear quadrupole moment
0
ontdekkingsdatum1997
parity+

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

94Se

Massagetal94
neutron number60
relative atomic mass
93,96049 ± 0,000537 Da
g-factor
0
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
spin0
nuclear quadrupole moment
0
ontdekkingsdatum1997
parity+

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

95Se

Massagetal95
neutron number61
relative atomic mass
94,9673 ± 0,000537 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
spin3/2
nuclear quadrupole moment
ontdekkingsdatum2010
parity+

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

geskiedenis

Ontdek deurJöns Berzelius
ligging van ontdekkingSweden
ontdekkingsdatum1818
etimologieGreek: selênê (moon).
uitspraaksi-LEE-ni-em (Engels)

source

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

Nuclear Screening Constants

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