Sezyûm

Sezyûm (Cs)

chemical element with symbol Cs and atomic number 55
Atomic Number55
Atomic Weight132.90545196
Hejmara baristeyî133
Group1
Period6
Blocks
Proton55 p+
Notron78 n0
Kareva55 e-
Animated Bohr model of Cs (Sezyûm)

Physical Property

Atomic Radius
260 pm
molar volume
Covalent Radius
232 pm
Metallic Radius
235 pm
ionic radius
167 pm
Crystal Radius
181 pm
Van der Waals radius
343 pm
density
1,873 g/cm³
Atomic Radii Of The Elements: Sezyûm0102030405060708090100110120130140150160170180190200210220230240250260270280290300310320330340350pmAtomic RadiusCovalent RadiusMetallic RadiusVan der Waals radius

Chemical Property

wize
proton affinity
electron affinity
0,471626 eV/particle
ionization energy
3,893905548 eV/particle
ionization energy of Cs (Sezyûm)
enthalpy of vaporization
68,3 kJ/mol
enthalpy of fusion
2,09 kJ/mol
standard enthalpy of formation
76,5 kJ/mol
Kareva
electron shell2, 8, 18, 18, 8, 1
Bohr model: Cs (Sezyûm)
valence electron1
Lewis structure: Cs (Sezyûm)
electron configuration[Xe] 6s1
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s1
Enhanced Bohr model of Cs (Sezyûm)
Orbital Diagram of Cs (Sezyûm)
oxidation number-1, 1
electronegativity
0.79
Electrophilicity Index
0,696095447101947 eV/particle
fundamental state of matter
phase of matterSolid
gaseous state of matter
Boiling Point
944,15 K
Melting Point
301,65 K
critical pressure
9,4 MPa
critical temperature
1.938,15 K
triple point
appearance
color
Silver
appearancesilvery gold
refractive index
thermodynamic material property
Thermal Conductivity
35,9 W/(m K)
thermal expansion
molar heat capacity
32,21 J/(mol K)
Specific Heat Capacity
0,242 J/(g⋅K)
heat capacity ratio
electrical properties
typeConductor
electrical conductivity
5 MS/m
electrical resistivity
0,0000002 m Ω
superconductivity
magnetism
typeparamagnetic
magnetic susceptibility (Mass)
0,0000000028 m³/Kg
magnetic susceptibility (Molar)
0,000000000372 m³/mol
magnetic susceptibility (Volume)
0,00000526
magnetic ordering
Germahiya Curie
Néel temperature
pêkhate
Crystal StructureBody Centered Cubic (BCC)
lattice constant
6,05 Å
Lattice Anglesπ/2, π/2, π/2
mechanical property
hardness
0,2 MPa
bulk modulus
1,6 GPa
shear modulus
Young's modulus
1,7 GPa
Poisson's ratio
Leza dengê
classification
CategoryAlkali metals, Alkali metals
CAS GroupIA
IUPAC GroupIA
Glawe Number8
Mendeleev Number5
Pettifor Number8
Geochemical Classalkali metal
Goldschmidt classificationlitophile

other

Gas Basicity
polarizability
400,9 ± 0,7 a₀
C6 Dispersion Coefficient
allotrope
Neutron cross section
29
Neutron Mass Absorption
0,0077
quantum number2S1/2
space group229 (Im_3m)

Isotopes of Cesium

Stable Isotopes1
Unstable Isotopes41
Natural Isotopes1

111Cs

Hejmara baristeyî111
neutron number56
Giraniya atomê
110,953945 ± 0,000215 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
spin3/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê
parity+

decay modeintensity
p (proton emission)

112Cs

Hejmara baristeyî112
neutron number57
Giraniya atomê
111,950172 ± 0,000124 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
490 ± 30 us
spin1
nuclear quadrupole moment
dema îcadkirinê yan keşfê1994
parity+

decay modeintensity
p (proton emission)100%
α (α emission)0.26%

113Cs

Hejmara baristeyî113
neutron number58
Giraniya atomê
112,944428484 ± 0,000009207 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
16,94 ± 0,09 us
spin3/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê1984
parity+

decay modeintensity
p (proton emission)100%

114Cs

Hejmara baristeyî114
neutron number59
Giraniya atomê
113,941292244 ± 0,000091323 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
570 ± 20 ms
spin1
nuclear quadrupole moment
dema îcadkirinê yan keşfê1978
parity+

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)100%
α (α emission)0.018%
β+ p (β+-delayed proton emission)8.7%
β+α (β+-delayed α emission)0.19%

115Cs

Hejmara baristeyî115
neutron number60
Giraniya atomê
114,93591 ± 0,00011 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
1,4 ± 0,8 s
spin9/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê1978
parity+

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)100%
β+ p (β+-delayed proton emission)0.07%

116Cs

Hejmara baristeyî116
neutron number61
Giraniya atomê
115,933395 ± 0,000108 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
700 ± 40 ms
spin1
nuclear quadrupole moment
dema îcadkirinê yan keşfê1975
parity+

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)100%
β+ p (β+-delayed proton emission)0.28%
β+α (β+-delayed α emission)0.049%

117Cs

Hejmara baristeyî117
neutron number62
Giraniya atomê
116,928616723 ± 0,000067 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
8,4 ± 0,6 s
spin9/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê1972
parity+

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

118Cs

Hejmara baristeyî118
neutron number63
Giraniya atomê
117,926559517 ± 0,00001369 Da
g-factor
1,935 ± 0,0025
natural abundance
radioactivity☢️ radioactive element
half-life
14 ± 2 s
spin2
nuclear quadrupole moment
1,31 ± 0,17
dema îcadkirinê yan keşfê1969
parity+

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)100%
β+ p (β+-delayed proton emission)0.021%
β+α (β+-delayed α emission)0.0012%

119Cs

Hejmara baristeyî119
neutron number64
Giraniya atomê
118,922377327 ± 0,000014965 Da
g-factor
1,2111111111111 ± 0,0066666666666667
natural abundance
radioactivity☢️ radioactive element
half-life
43 ± 0,2 s
spin9/2
nuclear quadrupole moment
2,65 ± 0,17
dema îcadkirinê yan keşfê1969
parity+

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)100%
β+α (β+-delayed α emission)2%

120Cs

Hejmara baristeyî120
neutron number65
Giraniya atomê
119,920677277 ± 0,000010702 Da
g-factor
1,93 ± 0,01
natural abundance
radioactivity☢️ radioactive element
half-life
60,4 ± 0,6 s
spin2
nuclear quadrupole moment
1,36 ± 0,07
dema îcadkirinê yan keşfê1969
parity+

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)100%
β+α (β+-delayed α emission)2%
β+ p (β+-delayed proton emission)7%

121Cs

Hejmara baristeyî121
neutron number66
Giraniya atomê
120,917227235 ± 0,00001534 Da
g-factor
0,51266666666667 ± 0,0026666666666667
natural abundance
radioactivity☢️ radioactive element
half-life
155 ± 4 s
spin3/2
nuclear quadrupole moment
0,79 ± 0,04
dema îcadkirinê yan keşfê1969
parity+

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

122Cs

Hejmara baristeyî122
neutron number67
Giraniya atomê
121,916108144 ± 0,000036164 Da
g-factor
0,133 ± 0,002
natural abundance
radioactivity☢️ radioactive element
half-life
21,18 ± 0,19 s
spin1
nuclear quadrupole moment
-0,179 ± 0,01
dema îcadkirinê yan keşfê1969
parity+

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)100%
β+α (β+-delayed α emission)2%

123Cs

Hejmara baristeyî123
neutron number68
Giraniya atomê
122,91299606 ± 0,000013 Da
g-factor
2,75 ± 0,014
natural abundance
radioactivity☢️ radioactive element
half-life
5,88 ± 0,03 m
spin1/2
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1954
parity+

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

124Cs

Hejmara baristeyî124
neutron number69
Giraniya atomê
123,912247366 ± 0,000009823 Da
g-factor
0,672 ± 0,003
natural abundance
radioactivity☢️ radioactive element
half-life
30,9 ± 0,4 s
spin1
nuclear quadrupole moment
-0,69 ± 0,04
dema îcadkirinê yan keşfê1969
parity+

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

125Cs

Hejmara baristeyî125
neutron number70
Giraniya atomê
124,909725953 ± 0,000008304 Da
g-factor
2,814 ± 0,014
natural abundance
radioactivity☢️ radioactive element
half-life
44,35 ± 0,29 m
spin1/2
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1954
parity+

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

126Cs

Hejmara baristeyî126
neutron number71
Giraniya atomê
125,909445821 ± 0,00001112 Da
g-factor
0,776 ± 0,004
natural abundance
radioactivity☢️ radioactive element
half-life
1,64 ± 0,02 m
spin1
nuclear quadrupole moment
-0,64 ± 0,03
dema îcadkirinê yan keşfê1954
parity+

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

127Cs

Hejmara baristeyî127
neutron number72
Giraniya atomê
126,907417527 ± 0,000005987 Da
g-factor
2,914 ± 0,014
natural abundance
radioactivity☢️ radioactive element
half-life
6,25 ± 0,1 h
spin1/2
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1950
parity+

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

128Cs

Hejmara baristeyî128
neutron number73
Giraniya atomê
127,907748452 ± 0,000005771 Da
g-factor
0,972 ± 0,005
natural abundance
radioactivity☢️ radioactive element
half-life
3,64 ± 0,014 m
spin1
nuclear quadrupole moment
-0,54 ± 0,03
dema îcadkirinê yan keşfê1951
parity+

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

129Cs

Hejmara baristeyî129
neutron number74
Giraniya atomê
128,90606591 ± 0,000004888 Da
g-factor
2,978 ± 0,016
natural abundance
radioactivity☢️ radioactive element
half-life
32,06 ± 0,06 h
spin1/2
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1950
parity+

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

130Cs

Hejmara baristeyî130
neutron number75
Giraniya atomê
129,906709281 ± 0,000008971 Da
g-factor
1,458 ± 0,007
natural abundance
radioactivity☢️ radioactive element
half-life
29,21 ± 0,04 m
spin1
nuclear quadrupole moment
-0,056 ± 0,006
dema îcadkirinê yan keşfê1952
parity+

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)98.4%
β (β decay)1.6%

131Cs

Hejmara baristeyî131
neutron number76
Giraniya atomê
130,905468457 ± 0,00000019 Da
g-factor
1,4144 ± 0,0012
natural abundance
radioactivity☢️ radioactive element
half-life
9,689 ± 0,016 d
spin5/2
nuclear quadrupole moment
0,59 ± 0,02
dema îcadkirinê yan keşfê1947
parity+

decay modeintensity
ϵ (electron capture)100%

132Cs

Hejmara baristeyî132
neutron number77
Giraniya atomê
131,90643774 ± 0,000001112 Da
g-factor
1,1095 ± 0,0035
natural abundance
radioactivity☢️ radioactive element
half-life
6,48 ± 0,006 d
spin2
nuclear quadrupole moment
0,48 ± 0,02
dema îcadkirinê yan keşfê1953
parity+

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)98.13%
β (β decay)1.87%

133Cs

Hejmara baristeyî133
neutron number78
Giraniya atomê
132,905451958 ± 0,000000008 Da
g-factor
0,73651428571429 ± 0,0004
natural abundance
100
radioactivitystable isotope
half-lifeNot Radioactive ☢️
spin7/2
nuclear quadrupole moment
-0,00343 ± 0,0001
dema îcadkirinê yan keşfê1921
parity+

134Cs

Hejmara baristeyî134
neutron number79
Giraniya atomê
133,906718501 ± 0,000000017 Da
g-factor
0,747325 ± 0,00035
natural abundance
radioactivity☢️ radioactive element
half-life
2,065 ± 0,0004 y
spin4
nuclear quadrupole moment
0,37 ± 0,02
dema îcadkirinê yan keşfê1940
parity+

decay modeintensity
β (β decay)100%
ϵ (electron capture)0.0003%

135Cs

Hejmara baristeyî135
neutron number80
Giraniya atomê
134,905976907 ± 0,00000039 Da
g-factor
0,77951428571429 ± 0,00037142857142857
natural abundance
radioactivity☢️ radioactive element
half-life
1,33 ± 0,19 My
spin7/2
nuclear quadrupole moment
0,048 ± 0,003
dema îcadkirinê yan keşfê1949
parity+

decay modeintensity
β (β decay)100%

136Cs

Hejmara baristeyî136
neutron number81
Giraniya atomê
135,907311431 ± 0,00000201 Da
g-factor
0,741 ± 0,003
natural abundance
radioactivity☢️ radioactive element
half-life
13,01 ± 0,05 d
spin5
nuclear quadrupole moment
0,213 ± 0,015
dema îcadkirinê yan keşfê1951
parity+

decay modeintensity
β (β decay)100%

137Cs

Hejmara baristeyî137
neutron number82
Giraniya atomê
136,907089296 ± 0,000000324 Da
g-factor
0,81068571428571 ± 0,0004
natural abundance
radioactivity☢️ radioactive element
half-life
30,04 ± 0,04 y
spin7/2
nuclear quadrupole moment
0,048 ± 0,002
dema îcadkirinê yan keşfê1951
parity+

decay modeintensity
β (β decay)100%

138Cs

Hejmara baristeyî138
neutron number83
Giraniya atomê
137,911017119 ± 0,000009831 Da
g-factor
0,233 ± 0,0013333333333333
natural abundance
radioactivity☢️ radioactive element
half-life
33,5 ± 0,2 m
spin3
nuclear quadrupole moment
0,112 ± 0,017
dema îcadkirinê yan keşfê1943
parity-

decay modeintensity
β (β decay)100%

139Cs

Hejmara baristeyî139
neutron number84
Giraniya atomê
138,913363822 ± 0,000003364 Da
g-factor
0,768 ± 0,0011428571428571
natural abundance
radioactivity☢️ radioactive element
half-life
9,27 ± 0,05 m
spin7/2
nuclear quadrupole moment
-0,063 ± 0,014
dema îcadkirinê yan keşfê1939
parity+

decay modeintensity
β (β decay)100%

140Cs

Hejmara baristeyî140
neutron number85
Giraniya atomê
139,917283707 ± 0,000008801 Da
g-factor
0,134 ± 0,001
natural abundance
radioactivity☢️ radioactive element
half-life
63,7 ± 0,3 s
spin1
nuclear quadrupole moment
-0,094 ± 0,015
dema îcadkirinê yan keşfê1950
parity-

decay modeintensity
β (β decay)100%

141Cs

Hejmara baristeyî141
neutron number86
Giraniya atomê
140,920045279 ± 0,000009871 Da
g-factor
0,69457142857143 ± 0,0028571428571429
natural abundance
radioactivity☢️ radioactive element
half-life
24,84 ± 0,16 s
spin7/2
nuclear quadrupole moment
-0,42 ± 0,07
dema îcadkirinê yan keşfê1962
parity+

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)0.0342%

142Cs

Hejmara baristeyî142
neutron number87
Giraniya atomê
141,924299514 ± 0,000007586 Da
g-factor
0
natural abundance
radioactivity☢️ radioactive element
half-life
1,687 ± 0,01 s
spin0
nuclear quadrupole moment
0
dema îcadkirinê yan keşfê1962
parity-

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)0.089%

143Cs

Hejmara baristeyî143
neutron number88
Giraniya atomê
142,927347346 ± 0,00000813 Da
g-factor
0,57933333333333 ± 0,0026666666666667
natural abundance
radioactivity☢️ radioactive element
half-life
1,802 ± 0,008 s
spin3/2
nuclear quadrupole moment
0,44 ± 0,03
dema îcadkirinê yan keşfê1962
parity+

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)1.62%

144Cs

Hejmara baristeyî144
neutron number89
Giraniya atomê
143,932075402 ± 0,000021612 Da
g-factor
-0,545 ± 0,003
natural abundance
radioactivity☢️ radioactive element
half-life
994 ± 6 ms
spin1
nuclear quadrupole moment
0,29 ± 0,02
dema îcadkirinê yan keşfê1967
parity-

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)2.98%

145Cs

Hejmara baristeyî145
neutron number90
Giraniya atomê
144,935528927 ± 0,000009733 Da
g-factor
0,522 ± 0,0026666666666667
natural abundance
radioactivity☢️ radioactive element
half-life
582 ± 4 ms
spin3/2
nuclear quadrupole moment
0,58 ± 0,06
dema îcadkirinê yan keşfê1971
parity+

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)12.8%

146Cs

Hejmara baristeyî146
neutron number91
Giraniya atomê
145,940621867 ± 0,000003106 Da
g-factor
-0,514 ± 0,002
natural abundance
radioactivity☢️ radioactive element
half-life
321,6 ± 0,9 ms
spin1
nuclear quadrupole moment
0,21 ± 0,03
dema îcadkirinê yan keşfê1971
parity-

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)14.2%
2n (2-neutron emission)

147Cs

Hejmara baristeyî147
neutron number92
Giraniya atomê
146,944261512 ± 0,000009 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
230,5 ± 0,9 ms
spin3/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê1978
parity+

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)28.5%

148Cs

Hejmara baristeyî148
neutron number93
Giraniya atomê
147,949639026 ± 0,000014 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
151,8 ± 1 ms
spin2
nuclear quadrupole moment
dema îcadkirinê yan keşfê1978
parity-

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)28.7%
2n (2-neutron emission)

149Cs

Hejmara baristeyî149
neutron number94
Giraniya atomê
148,953516 ± 0,000429 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
112,3 ± 2,5 ms
spin3/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê1979
parity+

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)25%
2n (2-neutron emission)

150Cs

Hejmara baristeyî150
neutron number95
Giraniya atomê
149,959023 ± 0,000429 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
81 ± 2,6 ms
spin2
nuclear quadrupole moment
dema îcadkirinê yan keşfê1979
parity-

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)44%
2n (2-neutron emission)

151Cs

Hejmara baristeyî151
neutron number96
Giraniya atomê
150,963199 ± 0,000537 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
59 ± 19 ms
spin3/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê1979
parity+

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

152Cs

Hejmara baristeyî152
neutron number97
Giraniya atomê
151,968728 ± 0,000537 Da
g-factor
natural abundance
radioactivity☢️ radioactive element
half-life
spin
nuclear quadrupole moment
dema îcadkirinê yan keşfê1987
parity

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

dîrok

kaşîf an îcadkerGustov Kirchoff, Robert Bunsen
location of discoveryGermany
dema îcadkirinê yan keşfê1860
BêjenasîLatin: coesius (sky blue); for the blue lines of its spectrum.
pronunciationSEE-zi-em (îngilîzî)

source

Abundance
Abundance in Earth's crust
natural abundance (Okyanûs)
0,0003 mg/L
natural abundance (human body)
0,000002 %
natural abundance (meteoroid)
0,000014 %
natural abundance (Roj)
0,0000008 %
Abundance in Universe
0,00000008 %

Nuclear Screening Constants

1s1.0957
2p4.1804
2s14.4884
3d14.0194
3p18.4222
3s18.6226
4d32.1616
4p29.1424
4s27.9576
5p41.349
5s39.5555
6s48.637