Seleni

Seleni (Se)

chemical element with symbol Se and atomic number 34
Atomic Number34
Atomic Weight78.971
Rhif màs80
Group16
Period4
Blockp
Proton34 p+
Niwtron46 n0
Electron34 e-
Animated Bohr model of Se (Seleni)

Nodwedd Ffisegol

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: Seleni020406080100120140160180200pmAtomic RadiusCovalent RadiusMetallic RadiusVan der Waals radius

Nodwedd Gemegol

egni
proton affinity
electron affinity
2.02067 eV/particle
ionization energy
9.752392 eV/particle
ionization energy of Se (Seleni)
enthalpy of vaporization
59.7 kJ/mol
enthalpy of fusion
5.23 kJ/mol
standard enthalpy of formation
227.2 kJ/mol
Electron
plisgyn yr electron2, 8, 18, 6
Bohr model: Se (Seleni)
valence electron6
Lewis structure: Se (Seleni)
trefn yr electronnau[Ar] 3d10 4s2 4p4
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4
Enhanced Bohr model of Se (Seleni)
Orbital Diagram of Se (Seleni)
Cyflwr ocsidiad-2, -1, 0, 1, 2, 3, 4, 5, 6
Electronegatifedd
2.55
Electrophilicity Index
2.2408492709619536 eV/particle
cyflwr sylfaenol mater
cyflwr materSolid
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
lliw
Gray
appearanceblack, red, and gray (not pictured) allotropes
Mynegrif plygiant
1.000895
nodwedd ffisegol gwrthrych
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
dargludedd trydanol
Gwrthedd
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
strwythur
Crystal StructureSimple Monoclinic (HEX)
lattice constant
4.36 Å
Lattice Anglesπ/2, 1.58493, π/2
nodwedd mecanyddol deunyddiau
hardness
2 MPa
bulk modulus
8.3 GPa
shear modulus
3.7 GPa
Young's modulus
10 GPa
Poisson's ratio
0.33
speed of sound
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

Rhif màs63
neutron number29
relative atomic mass
62.981911 ± 0.000537 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
13.2 ± 3.9 ms
spin3/2
nuclear quadrupole moment
dyddiad darganfod2016
parity-

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

64Se

Rhif màs64
neutron number30
relative atomic mass
63.971165 ± 0.000537 Da
g-factor
0
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
22.6 ± 0.2 ms
spin0
nuclear quadrupole moment
0
dyddiad darganfod2005
parity+

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

65Se

Rhif màs65
neutron number31
relative atomic mass
64.964552 ± 0.000322 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
34.2 ± 0.7 ms
spin3/2
nuclear quadrupole moment
dyddiad darganfod1993
parity-

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

66Se

Rhif màs66
neutron number32
relative atomic mass
65.955276 ± 0.000215 Da
g-factor
0
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
54 ± 4 ms
spin0
nuclear quadrupole moment
0
dyddiad darganfod1993
parity+

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

67Se

Rhif màs67
neutron number33
relative atomic mass
66.949994 ± 0.000072 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
133 ± 4 ms
spin5/2
nuclear quadrupole moment
dyddiad darganfod1991
parity-

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

68Se

Rhif màs68
neutron number34
relative atomic mass
67.941825236 ± 0.000000532 Da
g-factor
0
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
35.5 ± 0.7 s
spin0
nuclear quadrupole moment
0
dyddiad darganfod1990
parity+

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

69Se

Rhif màs69
neutron number35
relative atomic mass
68.939414845 ± 0.000001599 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
27.4 ± 0.2 s
spin1/2
nuclear quadrupole moment
0
dyddiad darganfod1974
parity-

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

70Se

Rhif màs70
neutron number36
relative atomic mass
69.933515521 ± 0.0000017 Da
g-factor
0
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
41.1 ± 0.3 m
spin0
nuclear quadrupole moment
0
dyddiad darganfod1950
parity+

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

71Se

Rhif màs71
neutron number37
relative atomic mass
70.932209431 ± 0.000003 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
4.74 ± 0.05 m
spin5/2
nuclear quadrupole moment
dyddiad darganfod1957
parity-

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

72Se

Rhif màs72
neutron number38
relative atomic mass
71.927140506 ± 0.0000021 Da
g-factor
0
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
8.4 ± 0.08 d
spin0
nuclear quadrupole moment
0
dyddiad darganfod1948
parity+

decay modeintensity
ϵ (electron capture)100%

73Se

Rhif màs73
neutron number39
relative atomic mass
72.926754881 ± 0.000007969 Da
g-factor
0.19822222222222 ± 0.0028888888888889
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
7.15 ± 0.09 h
spin9/2
nuclear quadrupole moment
dyddiad darganfod1948
parity+

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

74Se

Rhif màs74
neutron number40
relative atomic mass
73.922475933 ± 0.000000015 Da
g-factor
0
natural abundance
0.86 ± 0.03
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
spin0
nuclear quadrupole moment
0
dyddiad darganfod1922
parity+

decay modeintensity
+ (double β+ decay)

75Se

Rhif màs75
neutron number41
relative atomic mass
74.92252287 ± 0.000000078 Da
g-factor
0.2732 ± 0.004
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
119.78 ± 0.03 d
spin5/2
nuclear quadrupole moment
1.1 ± 0.2
dyddiad darganfod1947
parity+

decay modeintensity
ϵ (electron capture)100%

76Se

Rhif màs76
neutron number42
relative atomic mass
75.919213702 ± 0.000000017 Da
g-factor
0
natural abundance
9.23 ± 0.07
Dadfeilio ymbelydrolstable isotope
Hanner oesNot Radioactive ☢️
spin0
nuclear quadrupole moment
0
dyddiad darganfod1922
parity+

77Se

Rhif màs77
neutron number43
relative atomic mass
76.91991415 ± 0.000000067 Da
g-factor
1.06712 ± 0.0001
natural abundance
7.6 ± 0.07
Dadfeilio ymbelydrolstable isotope
Hanner oesNot Radioactive ☢️
spin1/2
nuclear quadrupole moment
0
dyddiad darganfod1922
parity-

78Se

Rhif màs78
neutron number44
relative atomic mass
77.917309244 ± 0.000000191 Da
g-factor
0
natural abundance
23.69 ± 0.22
Dadfeilio ymbelydrolstable isotope
Hanner oesNot Radioactive ☢️
spin0
nuclear quadrupole moment
0
dyddiad darganfod1922
parity+

79Se

Rhif màs79
neutron number45
relative atomic mass
78.918499252 ± 0.000000238 Da
g-factor
-0.29085714285714 ± 0.0042857142857143
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
327 ± 28 ky
spin7/2
nuclear quadrupole moment
0.8 ± 0.2
dyddiad darganfod1950
parity+

decay modeintensity
β (β decay)100%

80Se

Rhif màs80
neutron number46
relative atomic mass
79.916521761 ± 0.000001016 Da
g-factor
0
natural abundance
49.8 ± 0.36
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
spin0
nuclear quadrupole moment
0
dyddiad darganfod1922
parity+

decay modeintensity
(double β decay)

81Se

Rhif màs81
neutron number47
relative atomic mass
80.917993019 ± 0.000001049 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
18.45 ± 0.12 m
spin1/2
nuclear quadrupole moment
0
dyddiad darganfod1948
parity-

decay modeintensity
β (β decay)100%

82Se

Rhif màs82
neutron number48
relative atomic mass
81.916699531 ± 0.0000005 Da
g-factor
0
natural abundance
8.82 ± 0.15
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
87.6 ± 1.5 Ey
spin0
nuclear quadrupole moment
0
dyddiad darganfod1922
parity+

decay modeintensity
(double β decay)100%

83Se

Rhif màs83
neutron number49
relative atomic mass
82.919118604 ± 0.000003259 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
22.25 ± 0.04 m
spin9/2
nuclear quadrupole moment
dyddiad darganfod1937
parity+

decay modeintensity
β (β decay)100%

84Se

Rhif màs84
neutron number50
relative atomic mass
83.918466761 ± 0.000002105 Da
g-factor
0
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
3.26 ± 0.1 m
spin0
nuclear quadrupole moment
0
dyddiad darganfod1960
parity+

decay modeintensity
β (β decay)100%

85Se

Rhif màs85
neutron number51
relative atomic mass
84.922260758 ± 0.000002804 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
32.9 ± 0.3 s
spin5/2
nuclear quadrupole moment
dyddiad darganfod1960
parity

decay modeintensity
β (β decay)100%

86Se

Rhif màs86
neutron number52
relative atomic mass
85.924311732 ± 0.000002705 Da
g-factor
0
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
14.3 ± 0.3 s
spin0
nuclear quadrupole moment
0
dyddiad darganfod1973
parity+

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

87Se

Rhif màs87
neutron number53
relative atomic mass
86.928688616 ± 0.000002405 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
5.5 ± 0.06 s
spin3/2
nuclear quadrupole moment
dyddiad darganfod1968
parity+

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

88Se

Rhif màs88
neutron number54
relative atomic mass
87.93141749 ± 0.000003604 Da
g-factor
0
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
1.53 ± 0.06 s
spin0
nuclear quadrupole moment
0
dyddiad darganfod1970
parity+

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

89Se

Rhif màs89
neutron number55
relative atomic mass
88.936669058 ± 0.000004003 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
430 ± 50 ms
spin5/2
nuclear quadrupole moment
dyddiad darganfod1971
parity+

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

90Se

Rhif màs90
neutron number56
relative atomic mass
89.940096 ± 0.000354 Da
g-factor
0
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
210 ± 80 ms
spin0
nuclear quadrupole moment
0
dyddiad darganfod1994
parity+

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

91Se

Rhif màs91
neutron number57
relative atomic mass
90.9457 ± 0.000465 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
270 ± 50 ms
spin1/2
nuclear quadrupole moment
0
dyddiad darganfod1975
parity+

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

92Se

Rhif màs92
neutron number58
relative atomic mass
91.94984 ± 0.000429 Da
g-factor
0
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
spin0
nuclear quadrupole moment
0
dyddiad darganfod1997
parity+

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

93Se

Rhif màs93
neutron number59
relative atomic mass
92.956135 ± 0.000429 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
spin1/2
nuclear quadrupole moment
0
dyddiad darganfod1997
parity+

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

94Se

Rhif màs94
neutron number60
relative atomic mass
93.96049 ± 0.000537 Da
g-factor
0
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
spin0
nuclear quadrupole moment
0
dyddiad darganfod1997
parity+

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

95Se

Rhif màs95
neutron number61
relative atomic mass
94.9673 ± 0.000537 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
spin3/2
nuclear quadrupole moment
dyddiad darganfod2010
parity+

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

hanes

darganfyddwr neu ddyfeisiwrJöns Berzelius
man darganfodSweden
dyddiad darganfod1818
geirdarddiadGreek: selênê (moon).
ynganiadsi-LEE-ni-em (Saesneg)

source

Abundance
Abundance in Earth's crust
0.05 mg/kg
natural abundance (cefnfor)
0.0002 mg/L
natural abundance (corff dynol)
0.000005 %
natural abundance (Awyrfaen)
0.0013 %
natural abundance (Haul)
Abundance in Universe
0.000003 %

Nuclear Screening Constants

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