Селен

Селен (Se)

chemical element with symbol Se and atomic number 34
Atomic Number34
Atomic Weight78.971
Адади массавӣ80
Group16
Period4
Blockp
proton34 p+
neutron46 n0
electron34 e-
Animated Bohr model of Se (Селен)

Хусусияти Физикӣ

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
зичӣ
4,809 g/cm³
Atomic Radii Of The Elements: Селен0102030405060708090100110120130140150160170180190pmAtomic RadiusCovalent RadiusMetallic RadiusVan der Waals radius

Chemical Property

энергия
proton affinity
electron affinity
2,02067 eV/particle
ionization energy
9,752392 eV/particle
ionization energy of Se (Селен)
enthalpy of vaporization
59,7 kJ/mol
гармои гудозиш
5,23 kJ/mol
standard enthalpy of formation
227,2 kJ/mol
electron
Абри электронӣ2, 8, 18, 6
Bohr model: Se (Селен)
valence electron6
Lewis structure: Se (Селен)
electron configuration[Ar] 3d10 4s2 4p4
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4
Enhanced Bohr model of Se (Селен)
Orbital Diagram of Se (Селен)
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
Ранг
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
heat capacity ratio
electrical properties
навъ
electrical conductivity
electrical resistivity
superconductivity
magnetism
навъdiamagnetic
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
сохт
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
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
ададҳои квантӣ3P2
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

Адади массавӣ63
neutron number29
relative atomic mass
62,981911 ± 0,000537 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
13,2 ± 3,9 ms
spin3/2
nuclear quadrupole moment
таърихи кашф2016
parity-

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

64Se

Адади массавӣ64
neutron number30
relative atomic mass
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
таърихи кашф2005
parity+

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

65Se

Адади массавӣ65
neutron number31
relative atomic mass
64,964552 ± 0,000322 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
34,2 ± 0,7 ms
spin3/2
nuclear quadrupole moment
таърихи кашф1993
parity-

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

66Se

Адади массавӣ66
neutron number32
relative atomic mass
65,955276 ± 0,000215 Da
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
54 ± 4 ms
spin0
nuclear quadrupole moment
0
таърихи кашф1993
parity+

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

67Se

Адади массавӣ67
neutron number33
relative atomic mass
66,949994 ± 0,000072 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
133 ± 4 ms
spin5/2
nuclear quadrupole moment
таърихи кашф1991
parity-

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

68Se

Адади массавӣ68
neutron number34
relative atomic mass
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
таърихи кашф1990
parity+

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

69Se

Адади массавӣ69
neutron number35
relative atomic mass
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
таърихи кашф1974
parity-

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

70Se

Адади массавӣ70
neutron number36
relative atomic mass
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
таърихи кашф1950
parity+

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

71Se

Адади массавӣ71
neutron number37
relative atomic mass
70,932209431 ± 0,000003 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
4,74 ± 0,05 m
spin5/2
nuclear quadrupole moment
таърихи кашф1957
parity-

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

72Se

Адади массавӣ72
neutron number38
relative atomic mass
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
таърихи кашф1948
parity+

decay modeintensity
ϵ (electron capture)100%

73Se

Адади массавӣ73
neutron number39
relative atomic mass
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
таърихи кашф1948
parity+

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

74Se

Адади массавӣ74
neutron number40
relative atomic mass
73,922475933 ± 0,000000015 Da
g-factor
0
natural abundance
0,86 ± 0,03
radioactivity☢️ radioactive element
half-life
spin0
nuclear quadrupole moment
0
таърихи кашф1922
parity+

decay modeintensity
+ (double β+ decay)

75Se

Адади массавӣ75
neutron number41
relative atomic mass
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
таърихи кашф1947
parity+

decay modeintensity
ϵ (electron capture)100%

76Se

Адади массавӣ76
neutron number42
relative atomic mass
75,919213702 ± 0,000000017 Da
g-factor
0
natural abundance
9,23 ± 0,07
radioactivitystable isotope
half-lifeNot Radioactive ☢️
spin0
nuclear quadrupole moment
0
таърихи кашф1922
parity+

77Se

Адади массавӣ77
neutron number43
relative atomic mass
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
таърихи кашф1922
parity-

78Se

Адади массавӣ78
neutron number44
relative atomic mass
77,917309244 ± 0,000000191 Da
g-factor
0
natural abundance
23,69 ± 0,22
radioactivitystable isotope
half-lifeNot Radioactive ☢️
spin0
nuclear quadrupole moment
0
таърихи кашф1922
parity+

79Se

Адади массавӣ79
neutron number45
relative atomic mass
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
таърихи кашф1950
parity+

decay modeintensity
β (β decay)100%

80Se

Адади массавӣ80
neutron number46
relative atomic mass
79,916521761 ± 0,000001016 Da
g-factor
0
natural abundance
49,8 ± 0,36
radioactivity☢️ radioactive element
half-life
spin0
nuclear quadrupole moment
0
таърихи кашф1922
parity+

decay modeintensity
(double β decay)

81Se

Адади массавӣ81
neutron number47
relative atomic mass
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
таърихи кашф1948
parity-

decay modeintensity
β (β decay)100%

82Se

Адади массавӣ82
neutron number48
relative atomic mass
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
таърихи кашф1922
parity+

decay modeintensity
(double β decay)100%

83Se

Адади массавӣ83
neutron number49
relative atomic mass
82,919118604 ± 0,000003259 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
22,25 ± 0,04 m
spin9/2
nuclear quadrupole moment
таърихи кашф1937
parity+

decay modeintensity
β (β decay)100%

84Se

Адади массавӣ84
neutron number50
relative atomic mass
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
таърихи кашф1960
parity+

decay modeintensity
β (β decay)100%

85Se

Адади массавӣ85
neutron number51
relative atomic mass
84,922260758 ± 0,000002804 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
32,9 ± 0,3 s
spin5/2
nuclear quadrupole moment
таърихи кашф1960
parity

decay modeintensity
β (β decay)100%

86Se

Адади массавӣ86
neutron number52
relative atomic mass
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
таърихи кашф1973
parity+

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

87Se

Адади массавӣ87
neutron number53
relative atomic mass
86,928688616 ± 0,000002405 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
5,5 ± 0,06 s
spin3/2
nuclear quadrupole moment
таърихи кашф1968
parity+

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

88Se

Адади массавӣ88
neutron number54
relative atomic mass
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
таърихи кашф1970
parity+

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

89Se

Адади массавӣ89
neutron number55
relative atomic mass
88,936669058 ± 0,000004003 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
430 ± 50 ms
spin5/2
nuclear quadrupole moment
таърихи кашф1971
parity+

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

90Se

Адади массавӣ90
neutron number56
relative atomic mass
89,940096 ± 0,000354 Da
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
210 ± 80 ms
spin0
nuclear quadrupole moment
0
таърихи кашф1994
parity+

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

91Se

Адади массавӣ91
neutron number57
relative atomic mass
90,9457 ± 0,000465 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
270 ± 50 ms
spin1/2
nuclear quadrupole moment
0
таърихи кашф1975
parity+

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

92Se

Адади массавӣ92
neutron number58
relative atomic mass
91,94984 ± 0,000429 Da
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
spin0
nuclear quadrupole moment
0
таърихи кашф1997
parity+

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

93Se

Адади массавӣ93
neutron number59
relative atomic mass
92,956135 ± 0,000429 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
spin1/2
nuclear quadrupole moment
0
таърихи кашф1997
parity+

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

94Se

Адади массавӣ94
neutron number60
relative atomic mass
93,96049 ± 0,000537 Da
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
spin0
nuclear quadrupole moment
0
таърихи кашф1997
parity+

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

95Se

Адади массавӣ95
neutron number61
relative atomic mass
94,9673 ± 0,000537 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
spin3/2
nuclear quadrupole moment
таърихи кашф2010
parity+

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

таърих

кошифJöns Berzelius
макони кашфSweden
таърихи кашф1818
РешашиносӣGreek: selênê (moon).
pronunciationsi-LEE-ni-em (Англисӣ)

source

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

Nuclear Screening Constants

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