Цезий

Цезий (Cs)

chemical element with symbol Cs and atomic number 55
Atomic Number55
Atomic Weight132.90545196
mass number133
Group1
Period6
Blocks
Протон55 p+
Нейтрон78 n0
Электрон55 e-
Animated Bohr model of Cs (Цезий)

Physical Property

Атомдук Радиус
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: Цезий0102030405060708090100110120130140150160170180190200210220230240250260270280290300310320330340350pmАтомдук РадиусCovalent RadiusMetallic RadiusVan der Waals radius

Chemical Property

энергия
proton affinity
electron affinity
0,471626 eV/particle
ionization energy
3,893905548 eV/particle
ionization energy of Cs (Цезий)
enthalpy of vaporization
68,3 kJ/mol
enthalpy of fusion
2,09 kJ/mol
standard enthalpy of formation
76,5 kJ/mol
Электрон
electron shell2, 8, 18, 18, 8, 1
Bohr model: Cs (Цезий)
valence electron1
Lewis structure: Cs (Цезий)
electron configuration[Xe] 6s1
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s1
Enhanced Bohr model of Cs (Цезий)
Orbital Diagram of Cs (Цезий)
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
Түс –
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
Магнетизм
typeparamagnetic
magnetic susceptibility (Mass)
0,0000000028 m³/Kg
magnetic susceptibility (Molar)
0,000000000372 m³/mol
magnetic susceptibility (Volume)
0,00000526
magnetic ordering
Curie temperature
Néel temperature
түзүм
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
speed of sound
classification
CategoryAlkali metals, Alkali metals
CAS GroupIA
IUPAC GroupIA
Glawe Number8
Mendeleev Number5
Pettifor Number8
Geochemical Classalkali metal
Литофиль элементтериlitophile

other

Gas Basicity
polarizability
400,9 ± 0,7 a₀
C6 Dispersion Coefficient
allotrope
Neutron cross section
29
Neutron Mass Absorption
0,0077
Кванттык сандар2S1/2
space group229 (Im_3m)

Isotopes of Cesium

Stable Isotopes1
Unstable Isotopes41
Natural Isotopes1

111Cs

mass number111
neutron number56
relative atomic mass
110,953945 ± 0,000215 Da
g-factor
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
Спин3/2
nuclear quadrupole moment
time of discovery or invention
parity+

decay modeintensity
p (proton emission)

112Cs

mass number112
neutron number57
relative atomic mass
111,950172 ± 0,000124 Da
g-factor
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
490 ± 30 us
Спин1
nuclear quadrupole moment
time of discovery or invention1994
parity+

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

113Cs

mass number113
neutron number58
relative atomic mass
112,944428484 ± 0,000009207 Da
g-factor
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
16,94 ± 0,09 us
Спин3/2
nuclear quadrupole moment
time of discovery or invention1984
parity+

decay modeintensity
p (proton emission)100%

114Cs

mass number114
neutron number59
relative atomic mass
113,941292244 ± 0,000091323 Da
g-factor
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
570 ± 20 ms
Спин1
nuclear quadrupole moment
time of discovery or invention1978
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

mass number115
neutron number60
relative atomic mass
114,93591 ± 0,00011 Da
g-factor
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
1,4 ± 0,8 s
Спин9/2
nuclear quadrupole moment
time of discovery or invention1978
parity+

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

116Cs

mass number116
neutron number61
relative atomic mass
115,933395 ± 0,000108 Da
g-factor
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
700 ± 40 ms
Спин1
nuclear quadrupole moment
time of discovery or invention1975
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

mass number117
neutron number62
relative atomic mass
116,928616723 ± 0,000067 Da
g-factor
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
8,4 ± 0,6 s
Спин9/2
nuclear quadrupole moment
time of discovery or invention1972
parity+

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

118Cs

mass number118
neutron number63
relative atomic mass
117,926559517 ± 0,00001369 Da
g-factor
1,935 ± 0,0025
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
14 ± 2 s
Спин2
nuclear quadrupole moment
1,31 ± 0,17
time of discovery or invention1969
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

mass number119
neutron number64
relative atomic mass
118,922377327 ± 0,000014965 Da
g-factor
1,2111111111111 ± 0,0066666666666667
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
43 ± 0,2 s
Спин9/2
nuclear quadrupole moment
2,65 ± 0,17
time of discovery or invention1969
parity+

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

120Cs

mass number120
neutron number65
relative atomic mass
119,920677277 ± 0,000010702 Da
g-factor
1,93 ± 0,01
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
60,4 ± 0,6 s
Спин2
nuclear quadrupole moment
1,36 ± 0,07
time of discovery or invention1969
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

mass number121
neutron number66
relative atomic mass
120,917227235 ± 0,00001534 Da
g-factor
0,51266666666667 ± 0,0026666666666667
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
155 ± 4 s
Спин3/2
nuclear quadrupole moment
0,79 ± 0,04
time of discovery or invention1969
parity+

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

122Cs

mass number122
neutron number67
relative atomic mass
121,916108144 ± 0,000036164 Da
g-factor
0,133 ± 0,002
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
21,18 ± 0,19 s
Спин1
nuclear quadrupole moment
-0,179 ± 0,01
time of discovery or invention1969
parity+

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

123Cs

mass number123
neutron number68
relative atomic mass
122,91299606 ± 0,000013 Da
g-factor
2,75 ± 0,014
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
5,88 ± 0,03 m
Спин1/2
nuclear quadrupole moment
0
time of discovery or invention1954
parity+

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

124Cs

mass number124
neutron number69
relative atomic mass
123,912247366 ± 0,000009823 Da
g-factor
0,672 ± 0,003
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
30,9 ± 0,4 s
Спин1
nuclear quadrupole moment
-0,69 ± 0,04
time of discovery or invention1969
parity+

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

125Cs

mass number125
neutron number70
relative atomic mass
124,909725953 ± 0,000008304 Da
g-factor
2,814 ± 0,014
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
44,35 ± 0,29 m
Спин1/2
nuclear quadrupole moment
0
time of discovery or invention1954
parity+

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

126Cs

mass number126
neutron number71
relative atomic mass
125,909445821 ± 0,00001112 Da
g-factor
0,776 ± 0,004
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
1,64 ± 0,02 m
Спин1
nuclear quadrupole moment
-0,64 ± 0,03
time of discovery or invention1954
parity+

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

127Cs

mass number127
neutron number72
relative atomic mass
126,907417527 ± 0,000005987 Da
g-factor
2,914 ± 0,014
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
6,25 ± 0,1 h
Спин1/2
nuclear quadrupole moment
0
time of discovery or invention1950
parity+

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

128Cs

mass number128
neutron number73
relative atomic mass
127,907748452 ± 0,000005771 Da
g-factor
0,972 ± 0,005
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
3,64 ± 0,014 m
Спин1
nuclear quadrupole moment
-0,54 ± 0,03
time of discovery or invention1951
parity+

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

129Cs

mass number129
neutron number74
relative atomic mass
128,90606591 ± 0,000004888 Da
g-factor
2,978 ± 0,016
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
32,06 ± 0,06 h
Спин1/2
nuclear quadrupole moment
0
time of discovery or invention1950
parity+

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

130Cs

mass number130
neutron number75
relative atomic mass
129,906709281 ± 0,000008971 Da
g-factor
1,458 ± 0,007
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
29,21 ± 0,04 m
Спин1
nuclear quadrupole moment
-0,056 ± 0,006
time of discovery or invention1952
parity+

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

131Cs

mass number131
neutron number76
relative atomic mass
130,905468457 ± 0,00000019 Da
g-factor
1,4144 ± 0,0012
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
9,689 ± 0,016 d
Спин5/2
nuclear quadrupole moment
0,59 ± 0,02
time of discovery or invention1947
parity+

decay modeintensity
ϵ (electron capture)100%

132Cs

mass number132
neutron number77
relative atomic mass
131,90643774 ± 0,000001112 Da
g-factor
1,1095 ± 0,0035
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
6,48 ± 0,006 d
Спин2
nuclear quadrupole moment
0,48 ± 0,02
time of discovery or invention1953
parity+

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

133Cs

mass number133
neutron number78
relative atomic mass
132,905451958 ± 0,000000008 Da
g-factor
0,73651428571429 ± 0,0004
natural abundance
100
Радиоактивдүүлүкstable isotope
half-lifeNot Radioactive ☢️
Спин7/2
nuclear quadrupole moment
-0,00343 ± 0,0001
time of discovery or invention1921
parity+

134Cs

mass number134
neutron number79
relative atomic mass
133,906718501 ± 0,000000017 Da
g-factor
0,747325 ± 0,00035
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
2,065 ± 0,0004 y
Спин4
nuclear quadrupole moment
0,37 ± 0,02
time of discovery or invention1940
parity+

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

135Cs

mass number135
neutron number80
relative atomic mass
134,905976907 ± 0,00000039 Da
g-factor
0,77951428571429 ± 0,00037142857142857
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
1,33 ± 0,19 My
Спин7/2
nuclear quadrupole moment
0,048 ± 0,003
time of discovery or invention1949
parity+

decay modeintensity
β (β decay)100%

136Cs

mass number136
neutron number81
relative atomic mass
135,907311431 ± 0,00000201 Da
g-factor
0,741 ± 0,003
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
13,01 ± 0,05 d
Спин5
nuclear quadrupole moment
0,213 ± 0,015
time of discovery or invention1951
parity+

decay modeintensity
β (β decay)100%

137Cs

mass number137
neutron number82
relative atomic mass
136,907089296 ± 0,000000324 Da
g-factor
0,81068571428571 ± 0,0004
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
30,04 ± 0,04 y
Спин7/2
nuclear quadrupole moment
0,048 ± 0,002
time of discovery or invention1951
parity+

decay modeintensity
β (β decay)100%

138Cs

mass number138
neutron number83
relative atomic mass
137,911017119 ± 0,000009831 Da
g-factor
0,233 ± 0,0013333333333333
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
33,5 ± 0,2 m
Спин3
nuclear quadrupole moment
0,112 ± 0,017
time of discovery or invention1943
parity-

decay modeintensity
β (β decay)100%

139Cs

mass number139
neutron number84
relative atomic mass
138,913363822 ± 0,000003364 Da
g-factor
0,768 ± 0,0011428571428571
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
9,27 ± 0,05 m
Спин7/2
nuclear quadrupole moment
-0,063 ± 0,014
time of discovery or invention1939
parity+

decay modeintensity
β (β decay)100%

140Cs

mass number140
neutron number85
relative atomic mass
139,917283707 ± 0,000008801 Da
g-factor
0,134 ± 0,001
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
63,7 ± 0,3 s
Спин1
nuclear quadrupole moment
-0,094 ± 0,015
time of discovery or invention1950
parity-

decay modeintensity
β (β decay)100%

141Cs

mass number141
neutron number86
relative atomic mass
140,920045279 ± 0,000009871 Da
g-factor
0,69457142857143 ± 0,0028571428571429
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
24,84 ± 0,16 s
Спин7/2
nuclear quadrupole moment
-0,42 ± 0,07
time of discovery or invention1962
parity+

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

142Cs

mass number142
neutron number87
relative atomic mass
141,924299514 ± 0,000007586 Da
g-factor
0
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
1,687 ± 0,01 s
Спин0
nuclear quadrupole moment
0
time of discovery or invention1962
parity-

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

143Cs

mass number143
neutron number88
relative atomic mass
142,927347346 ± 0,00000813 Da
g-factor
0,57933333333333 ± 0,0026666666666667
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
1,802 ± 0,008 s
Спин3/2
nuclear quadrupole moment
0,44 ± 0,03
time of discovery or invention1962
parity+

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

144Cs

mass number144
neutron number89
relative atomic mass
143,932075402 ± 0,000021612 Da
g-factor
-0,545 ± 0,003
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
994 ± 6 ms
Спин1
nuclear quadrupole moment
0,29 ± 0,02
time of discovery or invention1967
parity-

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

145Cs

mass number145
neutron number90
relative atomic mass
144,935528927 ± 0,000009733 Da
g-factor
0,522 ± 0,0026666666666667
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
582 ± 4 ms
Спин3/2
nuclear quadrupole moment
0,58 ± 0,06
time of discovery or invention1971
parity+

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

146Cs

mass number146
neutron number91
relative atomic mass
145,940621867 ± 0,000003106 Da
g-factor
-0,514 ± 0,002
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
321,6 ± 0,9 ms
Спин1
nuclear quadrupole moment
0,21 ± 0,03
time of discovery or invention1971
parity-

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

147Cs

mass number147
neutron number92
relative atomic mass
146,944261512 ± 0,000009 Da
g-factor
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
230,5 ± 0,9 ms
Спин3/2
nuclear quadrupole moment
time of discovery or invention1978
parity+

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

148Cs

mass number148
neutron number93
relative atomic mass
147,949639026 ± 0,000014 Da
g-factor
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
151,8 ± 1 ms
Спин2
nuclear quadrupole moment
time of discovery or invention1978
parity-

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

149Cs

mass number149
neutron number94
relative atomic mass
148,953516 ± 0,000429 Da
g-factor
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
112,3 ± 2,5 ms
Спин3/2
nuclear quadrupole moment
time of discovery or invention1979
parity+

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

150Cs

mass number150
neutron number95
relative atomic mass
149,959023 ± 0,000429 Da
g-factor
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
81 ± 2,6 ms
Спин2
nuclear quadrupole moment
time of discovery or invention1979
parity-

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

151Cs

mass number151
neutron number96
relative atomic mass
150,963199 ± 0,000537 Da
g-factor
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
59 ± 19 ms
Спин3/2
nuclear quadrupole moment
time of discovery or invention1979
parity+

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

152Cs

mass number152
neutron number97
relative atomic mass
151,968728 ± 0,000537 Da
g-factor
natural abundance
Радиоактивдүүлүк☢️ Радиоактивдүү элементтер —
half-life
Спин
nuclear quadrupole moment
time of discovery or invention1987
parity

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

тарых

discoverer or inventorGustov Kirchoff, Robert Bunsen
location of discoveryGermany
time of discovery or invention1860
ЭтимологияLatin: coesius (sky blue); for the blue lines of its spectrum.
pronunciationSEE-zi-em (англисче)

source

Abundance
Abundance in Earth's crust
natural abundance (Океан)
0,0003 mg/L
natural abundance (human body)
0,000002 %
natural abundance (meteoroid)
0,000014 %
natural abundance (Күн)
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