Seleni

Seleni (Se)

chemical element with symbol Se and atomic number 34
Atomic Number34
Atomic Weight78.971
mass number80
Group16
Period4
Blockp
protoni34 p+
nyutroni46 n0
elektroni34 e-
Animated Bohr model of Se (Seleni)

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
msongamano
4.809 g/cm³
Atomic Radii Of The Elements: Seleni0102030405060708090100110120130140150160170180190pmAtomic RadiusCovalent RadiusMetallic RadiusVan der Waals radius

Chemical Property

nishati
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
elektroni
Mzingo elektroni2, 8, 18, 6
Bohr model: Se (Seleni)
valence electron6
Lewis structure: Se (Seleni)
electron configuration[Ar] 3d10 4s2 4p4
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4
Enhanced Bohr model of Se (Seleni)
Orbital Diagram of Se (Seleni)
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
Kiwango utatu
appearance
Rangi
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
Uga sumaku
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
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

mass number63
neutron number29
relative atomic mass
62.981911 ± 0.000537 Da
g-factor
natural abundance
Unururifu☢️ radioactive element
Nusumaisha
13.2 ± 3.9 ms
spin3/2
nuclear quadrupole moment
Uvumbuzi2016
parity-

hali ya kuozaintensity
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
63.971165 ± 0.000537 Da
g-factor
0
natural abundance
Unururifu☢️ radioactive element
Nusumaisha
22.6 ± 0.2 ms
spin0
nuclear quadrupole moment
0
Uvumbuzi2005
parity+

hali ya kuozaintensity
β+ (β+ decay; β+ = ϵ + e+)
β+ p (β+-delayed proton emission)

65Se

mass number65
neutron number31
relative atomic mass
64.964552 ± 0.000322 Da
g-factor
natural abundance
Unururifu☢️ radioactive element
Nusumaisha
34.2 ± 0.7 ms
spin3/2
nuclear quadrupole moment
Uvumbuzi1993
parity-

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

66Se

mass number66
neutron number32
relative atomic mass
65.955276 ± 0.000215 Da
g-factor
0
natural abundance
Unururifu☢️ radioactive element
Nusumaisha
54 ± 4 ms
spin0
nuclear quadrupole moment
0
Uvumbuzi1993
parity+

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

67Se

mass number67
neutron number33
relative atomic mass
66.949994 ± 0.000072 Da
g-factor
natural abundance
Unururifu☢️ radioactive element
Nusumaisha
133 ± 4 ms
spin5/2
nuclear quadrupole moment
Uvumbuzi1991
parity-

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

68Se

mass number68
neutron number34
relative atomic mass
67.941825236 ± 0.000000532 Da
g-factor
0
natural abundance
Unururifu☢️ radioactive element
Nusumaisha
35.5 ± 0.7 s
spin0
nuclear quadrupole moment
0
Uvumbuzi1990
parity+

hali ya kuozaintensity
β+ (β+ decay; β+ = ϵ + e+)100%

69Se

mass number69
neutron number35
relative atomic mass
68.939414845 ± 0.000001599 Da
g-factor
natural abundance
Unururifu☢️ radioactive element
Nusumaisha
27.4 ± 0.2 s
spin1/2
nuclear quadrupole moment
0
Uvumbuzi1974
parity-

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

70Se

mass number70
neutron number36
relative atomic mass
69.933515521 ± 0.0000017 Da
g-factor
0
natural abundance
Unururifu☢️ radioactive element
Nusumaisha
41.1 ± 0.3 m
spin0
nuclear quadrupole moment
0
Uvumbuzi1950
parity+

hali ya kuozaintensity
β+ (β+ decay; β+ = ϵ + e+)100%

71Se

mass number71
neutron number37
relative atomic mass
70.932209431 ± 0.000003 Da
g-factor
natural abundance
Unururifu☢️ radioactive element
Nusumaisha
4.74 ± 0.05 m
spin5/2
nuclear quadrupole moment
Uvumbuzi1957
parity-

hali ya kuozaintensity
β+ (β+ decay; β+ = ϵ + e+)100%

72Se

mass number72
neutron number38
relative atomic mass
71.927140506 ± 0.0000021 Da
g-factor
0
natural abundance
Unururifu☢️ radioactive element
Nusumaisha
8.4 ± 0.08 d
spin0
nuclear quadrupole moment
0
Uvumbuzi1948
parity+

hali ya kuozaintensity
ϵ (electron capture)100%

73Se

mass number73
neutron number39
relative atomic mass
72.926754881 ± 0.000007969 Da
g-factor
0.19822222222222 ± 0.0028888888888889
natural abundance
Unururifu☢️ radioactive element
Nusumaisha
7.15 ± 0.09 h
spin9/2
nuclear quadrupole moment
Uvumbuzi1948
parity+

hali ya kuozaintensity
β+ (β+ decay; β+ = ϵ + e+)100%

74Se

mass number74
neutron number40
relative atomic mass
73.922475933 ± 0.000000015 Da
g-factor
0
natural abundance
0.86 ± 0.03
Unururifu☢️ radioactive element
Nusumaisha
spin0
nuclear quadrupole moment
0
Uvumbuzi1922
parity+

hali ya kuozaintensity
+ (double β+ decay)

75Se

mass number75
neutron number41
relative atomic mass
74.92252287 ± 0.000000078 Da
g-factor
0.2732 ± 0.004
natural abundance
Unururifu☢️ radioactive element
Nusumaisha
119.78 ± 0.03 d
spin5/2
nuclear quadrupole moment
1.1 ± 0.2
Uvumbuzi1947
parity+

hali ya kuozaintensity
ϵ (electron capture)100%

76Se

mass number76
neutron number42
relative atomic mass
75.919213702 ± 0.000000017 Da
g-factor
0
natural abundance
9.23 ± 0.07
Unururifustable isotope
NusumaishaNot Radioactive ☢️
spin0
nuclear quadrupole moment
0
Uvumbuzi1922
parity+

77Se

mass number77
neutron number43
relative atomic mass
76.91991415 ± 0.000000067 Da
g-factor
1.06712 ± 0.0001
natural abundance
7.6 ± 0.07
Unururifustable isotope
NusumaishaNot Radioactive ☢️
spin1/2
nuclear quadrupole moment
0
Uvumbuzi1922
parity-

78Se

mass number78
neutron number44
relative atomic mass
77.917309244 ± 0.000000191 Da
g-factor
0
natural abundance
23.69 ± 0.22
Unururifustable isotope
NusumaishaNot Radioactive ☢️
spin0
nuclear quadrupole moment
0
Uvumbuzi1922
parity+

79Se

mass number79
neutron number45
relative atomic mass
78.918499252 ± 0.000000238 Da
g-factor
-0.29085714285714 ± 0.0042857142857143
natural abundance
Unururifu☢️ radioactive element
Nusumaisha
327 ± 28 ky
spin7/2
nuclear quadrupole moment
0.8 ± 0.2
Uvumbuzi1950
parity+

hali ya kuozaintensity
β (β decay)100%

80Se

mass number80
neutron number46
relative atomic mass
79.916521761 ± 0.000001016 Da
g-factor
0
natural abundance
49.8 ± 0.36
Unururifu☢️ radioactive element
Nusumaisha
spin0
nuclear quadrupole moment
0
Uvumbuzi1922
parity+

hali ya kuozaintensity
(double β decay)

81Se

mass number81
neutron number47
relative atomic mass
80.917993019 ± 0.000001049 Da
g-factor
natural abundance
Unururifu☢️ radioactive element
Nusumaisha
18.45 ± 0.12 m
spin1/2
nuclear quadrupole moment
0
Uvumbuzi1948
parity-

hali ya kuozaintensity
β (β decay)100%

82Se

mass number82
neutron number48
relative atomic mass
81.916699531 ± 0.0000005 Da
g-factor
0
natural abundance
8.82 ± 0.15
Unururifu☢️ radioactive element
Nusumaisha
87.6 ± 1.5 Ey
spin0
nuclear quadrupole moment
0
Uvumbuzi1922
parity+

hali ya kuozaintensity
(double β decay)100%

83Se

mass number83
neutron number49
relative atomic mass
82.919118604 ± 0.000003259 Da
g-factor
natural abundance
Unururifu☢️ radioactive element
Nusumaisha
22.25 ± 0.04 m
spin9/2
nuclear quadrupole moment
Uvumbuzi1937
parity+

hali ya kuozaintensity
β (β decay)100%

84Se

mass number84
neutron number50
relative atomic mass
83.918466761 ± 0.000002105 Da
g-factor
0
natural abundance
Unururifu☢️ radioactive element
Nusumaisha
3.26 ± 0.1 m
spin0
nuclear quadrupole moment
0
Uvumbuzi1960
parity+

hali ya kuozaintensity
β (β decay)100%

85Se

mass number85
neutron number51
relative atomic mass
84.922260758 ± 0.000002804 Da
g-factor
natural abundance
Unururifu☢️ radioactive element
Nusumaisha
32.9 ± 0.3 s
spin5/2
nuclear quadrupole moment
Uvumbuzi1960
parity

hali ya kuozaintensity
β (β decay)100%

86Se

mass number86
neutron number52
relative atomic mass
85.924311732 ± 0.000002705 Da
g-factor
0
natural abundance
Unururifu☢️ radioactive element
Nusumaisha
14.3 ± 0.3 s
spin0
nuclear quadrupole moment
0
Uvumbuzi1973
parity+

hali ya kuozaintensity
β (β decay)100%
β n (β-delayed neutron emission)

87Se

mass number87
neutron number53
relative atomic mass
86.928688616 ± 0.000002405 Da
g-factor
natural abundance
Unururifu☢️ radioactive element
Nusumaisha
5.5 ± 0.06 s
spin3/2
nuclear quadrupole moment
Uvumbuzi1968
parity+

hali ya kuozaintensity
β (β decay)100%
β n (β-delayed neutron emission)0.6%

88Se

mass number88
neutron number54
relative atomic mass
87.93141749 ± 0.000003604 Da
g-factor
0
natural abundance
Unururifu☢️ radioactive element
Nusumaisha
1.53 ± 0.06 s
spin0
nuclear quadrupole moment
0
Uvumbuzi1970
parity+

hali ya kuozaintensity
β (β decay)100%
β n (β-delayed neutron emission)0.99%

89Se

mass number89
neutron number55
relative atomic mass
88.936669058 ± 0.000004003 Da
g-factor
natural abundance
Unururifu☢️ radioactive element
Nusumaisha
430 ± 50 ms
spin5/2
nuclear quadrupole moment
Uvumbuzi1971
parity+

hali ya kuozaintensity
β (β decay)100%
β n (β-delayed neutron emission)7.8%

90Se

mass number90
neutron number56
relative atomic mass
89.940096 ± 0.000354 Da
g-factor
0
natural abundance
Unururifu☢️ radioactive element
Nusumaisha
210 ± 80 ms
spin0
nuclear quadrupole moment
0
Uvumbuzi1994
parity+

hali ya kuozaintensity
β (β decay)100%
β n (β-delayed neutron emission)

91Se

mass number91
neutron number57
relative atomic mass
90.9457 ± 0.000465 Da
g-factor
natural abundance
Unururifu☢️ radioactive element
Nusumaisha
270 ± 50 ms
spin1/2
nuclear quadrupole moment
0
Uvumbuzi1975
parity+

hali ya kuozaintensity
β (β decay)100%
β n (β-delayed neutron emission)21%
2n (2-neutron emission)

92Se

mass number92
neutron number58
relative atomic mass
91.94984 ± 0.000429 Da
g-factor
0
natural abundance
Unururifu☢️ radioactive element
Nusumaisha
spin0
nuclear quadrupole moment
0
Uvumbuzi1997
parity+

hali ya kuozaintensity
β (β decay)
β n (β-delayed neutron emission)
2n (2-neutron emission)

93Se

mass number93
neutron number59
relative atomic mass
92.956135 ± 0.000429 Da
g-factor
natural abundance
Unururifu☢️ radioactive element
Nusumaisha
spin1/2
nuclear quadrupole moment
0
Uvumbuzi1997
parity+

hali ya kuozaintensity
β (β decay)
β n (β-delayed neutron emission)
2n (2-neutron emission)

94Se

mass number94
neutron number60
relative atomic mass
93.96049 ± 0.000537 Da
g-factor
0
natural abundance
Unururifu☢️ radioactive element
Nusumaisha
spin0
nuclear quadrupole moment
0
Uvumbuzi1997
parity+

hali ya kuozaintensity
β (β decay)
β n (β-delayed neutron emission)
2n (2-neutron emission)

95Se

mass number95
neutron number61
relative atomic mass
94.9673 ± 0.000537 Da
g-factor
natural abundance
Unururifu☢️ radioactive element
Nusumaisha
spin3/2
nuclear quadrupole moment
Uvumbuzi2010
parity+

hali ya kuozaintensity
β (β decay)
β n (β-delayed neutron emission)
2n (2-neutron emission)
Selen 1

historia

mgunduzi au mvumbuziJöns Berzelius
location of discoverySweden
Uvumbuzi1818
EtimolojiaGreek: selênê (moon).
pronunciationsi-LEE-ni-em (Kiingereza)

source

Abundance
Abundance in Earth's crust
0.05 mg/kg
natural abundance (Bahari)
0.0002 mg/L
natural abundance (Mwili)
0.000005 %
natural abundance (Kimondo)
0.0013 %
natural abundance (Jua)
Abundance in Universe
0.000003 %

Nuclear Screening Constants

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