Sesium

Sesium (Cs)

chemical element with symbol Cs and atomic number 55
Atomic Number55
Atomic Weight132.90545196
Massagetal133
Group1
Period6
Blocks
proton55 p+
neutron78 n0
elektron55 e-
Animated Bohr model of Cs (Sesium)

Physical Property

Atoomradius
260 pm
molar volume
Covalent Radius
232 pm
Metallic Radius
235 pm
Ioonradius
167 pm
Crystal Radius
181 pm
Van der Waals radius
343 pm
density
1,873 g/cm³
Atomic Radii Of The Elements: Sesium0255075100125150175200225250275300325350pmAtoomradiusCovalent RadiusMetallic RadiusVan der Waals radius

Chemical Property

energie
proton affinity
electron affinity
0,471626 eV/particle
ionization energy
3,893905548 eV/particle
ionization energy of Cs (Sesium)
Verdampingswarmte
68,3 kJ/mol
smeltingswarmte
2,09 kJ/mol
Vormingsentalpie
76,5 kJ/mol
elektron
Elektronskil2, 8, 18, 18, 8, 1
Bohr model: Cs (Sesium)
Valenselektrone1
Lewisteorie: Cs (Sesium)
elektronkonfigurasie[Xe] 6s1
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s1
Enhanced Bohr model of Cs (Sesium)
Orbital Diagram of Cs (Sesium)
Oksidasietoestand-1, 1
Elektronegatiwiteit
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
kleur
Silver
appearancesilvery gold
Brekingsindeks
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
Geleidingsvermoë
5 MS/m
Elektriese resistiwiteit
0,0000002 m Ω
superconductivity
Magnetisme
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
structure
Crystal StructureBody Centered Cubic (BCC)
lattice constant
6,05 Å
Lattice Anglesπ/2, π/2, π/2
mechanical property
hardness
0,2 MPa
Massamodulus
1,6 GPa
Skuifmodulus
Young se modulus
1,7 GPa
Poisson se verhouding
Spoed van klank
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
Ruimtegroep229 (Im_3m)

Isotopes of Cesium

Stable Isotopes1
Unstable Isotopes41
Natural Isotopes1

111Cs

Massagetal111
neutron number56
relative atomic mass
110,953945 ± 0,000215 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
spin3/2
nuclear quadrupole moment
ontdekkingsdatum
parity+

decay modeintensity
p (proton emission)

112Cs

Massagetal112
neutron number57
relative atomic mass
111,950172 ± 0,000124 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
490 ± 30 us
spin1
nuclear quadrupole moment
ontdekkingsdatum1994
parity+

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

113Cs

Massagetal113
neutron number58
relative atomic mass
112,944428484 ± 0,000009207 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
16,94 ± 0,09 us
spin3/2
nuclear quadrupole moment
ontdekkingsdatum1984
parity+

decay modeintensity
p (proton emission)100%

114Cs

Massagetal114
neutron number59
relative atomic mass
113,941292244 ± 0,000091323 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
570 ± 20 ms
spin1
nuclear quadrupole moment
ontdekkingsdatum1978
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

Massagetal115
neutron number60
relative atomic mass
114,93591 ± 0,00011 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
1,4 ± 0,8 s
spin9/2
nuclear quadrupole moment
ontdekkingsdatum1978
parity+

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

116Cs

Massagetal116
neutron number61
relative atomic mass
115,933395 ± 0,000108 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
700 ± 40 ms
spin1
nuclear quadrupole moment
ontdekkingsdatum1975
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

Massagetal117
neutron number62
relative atomic mass
116,928616723 ± 0,000067 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
8,4 ± 0,6 s
spin9/2
nuclear quadrupole moment
ontdekkingsdatum1972
parity+

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

118Cs

Massagetal118
neutron number63
relative atomic mass
117,926559517 ± 0,00001369 Da
g-factor
1,935 ± 0,0025
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
14 ± 2 s
spin2
nuclear quadrupole moment
1,31 ± 0,17
ontdekkingsdatum1969
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

Massagetal119
neutron number64
relative atomic mass
118,922377327 ± 0,000014965 Da
g-factor
1,2111111111111 ± 0,0066666666666667
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
43 ± 0,2 s
spin9/2
nuclear quadrupole moment
2,65 ± 0,17
ontdekkingsdatum1969
parity+

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

120Cs

Massagetal120
neutron number65
relative atomic mass
119,920677277 ± 0,000010702 Da
g-factor
1,93 ± 0,01
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
60,4 ± 0,6 s
spin2
nuclear quadrupole moment
1,36 ± 0,07
ontdekkingsdatum1969
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

Massagetal121
neutron number66
relative atomic mass
120,917227235 ± 0,00001534 Da
g-factor
0,51266666666667 ± 0,0026666666666667
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
155 ± 4 s
spin3/2
nuclear quadrupole moment
0,79 ± 0,04
ontdekkingsdatum1969
parity+

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

122Cs

Massagetal122
neutron number67
relative atomic mass
121,916108144 ± 0,000036164 Da
g-factor
0,133 ± 0,002
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
21,18 ± 0,19 s
spin1
nuclear quadrupole moment
-0,179 ± 0,01
ontdekkingsdatum1969
parity+

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

123Cs

Massagetal123
neutron number68
relative atomic mass
122,91299606 ± 0,000013 Da
g-factor
2,75 ± 0,014
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
5,88 ± 0,03 m
spin1/2
nuclear quadrupole moment
0
ontdekkingsdatum1954
parity+

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

124Cs

Massagetal124
neutron number69
relative atomic mass
123,912247366 ± 0,000009823 Da
g-factor
0,672 ± 0,003
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
30,9 ± 0,4 s
spin1
nuclear quadrupole moment
-0,69 ± 0,04
ontdekkingsdatum1969
parity+

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

125Cs

Massagetal125
neutron number70
relative atomic mass
124,909725953 ± 0,000008304 Da
g-factor
2,814 ± 0,014
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
44,35 ± 0,29 m
spin1/2
nuclear quadrupole moment
0
ontdekkingsdatum1954
parity+

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

126Cs

Massagetal126
neutron number71
relative atomic mass
125,909445821 ± 0,00001112 Da
g-factor
0,776 ± 0,004
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
1,64 ± 0,02 m
spin1
nuclear quadrupole moment
-0,64 ± 0,03
ontdekkingsdatum1954
parity+

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

127Cs

Massagetal127
neutron number72
relative atomic mass
126,907417527 ± 0,000005987 Da
g-factor
2,914 ± 0,014
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
6,25 ± 0,1 h
spin1/2
nuclear quadrupole moment
0
ontdekkingsdatum1950
parity+

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

128Cs

Massagetal128
neutron number73
relative atomic mass
127,907748452 ± 0,000005771 Da
g-factor
0,972 ± 0,005
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
3,64 ± 0,014 m
spin1
nuclear quadrupole moment
-0,54 ± 0,03
ontdekkingsdatum1951
parity+

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

129Cs

Massagetal129
neutron number74
relative atomic mass
128,90606591 ± 0,000004888 Da
g-factor
2,978 ± 0,016
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
32,06 ± 0,06 h
spin1/2
nuclear quadrupole moment
0
ontdekkingsdatum1950
parity+

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

130Cs

Massagetal130
neutron number75
relative atomic mass
129,906709281 ± 0,000008971 Da
g-factor
1,458 ± 0,007
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
29,21 ± 0,04 m
spin1
nuclear quadrupole moment
-0,056 ± 0,006
ontdekkingsdatum1952
parity+

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

131Cs

Massagetal131
neutron number76
relative atomic mass
130,905468457 ± 0,00000019 Da
g-factor
1,4144 ± 0,0012
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
9,689 ± 0,016 d
spin5/2
nuclear quadrupole moment
0,59 ± 0,02
ontdekkingsdatum1947
parity+

decay modeintensity
ϵ (electron capture)100%

132Cs

Massagetal132
neutron number77
relative atomic mass
131,90643774 ± 0,000001112 Da
g-factor
1,1095 ± 0,0035
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
6,48 ± 0,006 d
spin2
nuclear quadrupole moment
0,48 ± 0,02
ontdekkingsdatum1953
parity+

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

133Cs

Massagetal133
neutron number78
relative atomic mass
132,905451958 ± 0,000000008 Da
g-factor
0,73651428571429 ± 0,0004
natural abundance
100
radioaktiwiteitStabiele isotoop
HalfleeftydNot Radioactive ☢️
spin7/2
nuclear quadrupole moment
-0,00343 ± 0,0001
ontdekkingsdatum1921
parity+

134Cs

Massagetal134
neutron number79
relative atomic mass
133,906718501 ± 0,000000017 Da
g-factor
0,747325 ± 0,00035
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
2,065 ± 0,0004 y
spin4
nuclear quadrupole moment
0,37 ± 0,02
ontdekkingsdatum1940
parity+

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

135Cs

Massagetal135
neutron number80
relative atomic mass
134,905976907 ± 0,00000039 Da
g-factor
0,77951428571429 ± 0,00037142857142857
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
1,33 ± 0,19 My
spin7/2
nuclear quadrupole moment
0,048 ± 0,003
ontdekkingsdatum1949
parity+

decay modeintensity
β (β decay)100%

136Cs

Massagetal136
neutron number81
relative atomic mass
135,907311431 ± 0,00000201 Da
g-factor
0,741 ± 0,003
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
13,01 ± 0,05 d
spin5
nuclear quadrupole moment
0,213 ± 0,015
ontdekkingsdatum1951
parity+

decay modeintensity
β (β decay)100%

137Cs

Massagetal137
neutron number82
relative atomic mass
136,907089296 ± 0,000000324 Da
g-factor
0,81068571428571 ± 0,0004
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
30,04 ± 0,04 y
spin7/2
nuclear quadrupole moment
0,048 ± 0,002
ontdekkingsdatum1951
parity+

decay modeintensity
β (β decay)100%

138Cs

Massagetal138
neutron number83
relative atomic mass
137,911017119 ± 0,000009831 Da
g-factor
0,233 ± 0,0013333333333333
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
33,5 ± 0,2 m
spin3
nuclear quadrupole moment
0,112 ± 0,017
ontdekkingsdatum1943
parity-

decay modeintensity
β (β decay)100%

139Cs

Massagetal139
neutron number84
relative atomic mass
138,913363822 ± 0,000003364 Da
g-factor
0,768 ± 0,0011428571428571
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
9,27 ± 0,05 m
spin7/2
nuclear quadrupole moment
-0,063 ± 0,014
ontdekkingsdatum1939
parity+

decay modeintensity
β (β decay)100%

140Cs

Massagetal140
neutron number85
relative atomic mass
139,917283707 ± 0,000008801 Da
g-factor
0,134 ± 0,001
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
63,7 ± 0,3 s
spin1
nuclear quadrupole moment
-0,094 ± 0,015
ontdekkingsdatum1950
parity-

decay modeintensity
β (β decay)100%

141Cs

Massagetal141
neutron number86
relative atomic mass
140,920045279 ± 0,000009871 Da
g-factor
0,69457142857143 ± 0,0028571428571429
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
24,84 ± 0,16 s
spin7/2
nuclear quadrupole moment
-0,42 ± 0,07
ontdekkingsdatum1962
parity+

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

142Cs

Massagetal142
neutron number87
relative atomic mass
141,924299514 ± 0,000007586 Da
g-factor
0
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
1,687 ± 0,01 s
spin0
nuclear quadrupole moment
0
ontdekkingsdatum1962
parity-

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

143Cs

Massagetal143
neutron number88
relative atomic mass
142,927347346 ± 0,00000813 Da
g-factor
0,57933333333333 ± 0,0026666666666667
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
1,802 ± 0,008 s
spin3/2
nuclear quadrupole moment
0,44 ± 0,03
ontdekkingsdatum1962
parity+

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

144Cs

Massagetal144
neutron number89
relative atomic mass
143,932075402 ± 0,000021612 Da
g-factor
-0,545 ± 0,003
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
994 ± 6 ms
spin1
nuclear quadrupole moment
0,29 ± 0,02
ontdekkingsdatum1967
parity-

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

145Cs

Massagetal145
neutron number90
relative atomic mass
144,935528927 ± 0,000009733 Da
g-factor
0,522 ± 0,0026666666666667
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
582 ± 4 ms
spin3/2
nuclear quadrupole moment
0,58 ± 0,06
ontdekkingsdatum1971
parity+

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

146Cs

Massagetal146
neutron number91
relative atomic mass
145,940621867 ± 0,000003106 Da
g-factor
-0,514 ± 0,002
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
321,6 ± 0,9 ms
spin1
nuclear quadrupole moment
0,21 ± 0,03
ontdekkingsdatum1971
parity-

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

147Cs

Massagetal147
neutron number92
relative atomic mass
146,944261512 ± 0,000009 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
230,5 ± 0,9 ms
spin3/2
nuclear quadrupole moment
ontdekkingsdatum1978
parity+

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

148Cs

Massagetal148
neutron number93
relative atomic mass
147,949639026 ± 0,000014 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
151,8 ± 1 ms
spin2
nuclear quadrupole moment
ontdekkingsdatum1978
parity-

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

149Cs

Massagetal149
neutron number94
relative atomic mass
148,953516 ± 0,000429 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
112,3 ± 2,5 ms
spin3/2
nuclear quadrupole moment
ontdekkingsdatum1979
parity+

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

150Cs

Massagetal150
neutron number95
relative atomic mass
149,959023 ± 0,000429 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
81 ± 2,6 ms
spin2
nuclear quadrupole moment
ontdekkingsdatum1979
parity-

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

151Cs

Massagetal151
neutron number96
relative atomic mass
150,963199 ± 0,000537 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
59 ± 19 ms
spin3/2
nuclear quadrupole moment
ontdekkingsdatum1979
parity+

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

152Cs

Massagetal152
neutron number97
relative atomic mass
151,968728 ± 0,000537 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
spin
nuclear quadrupole moment
ontdekkingsdatum1987
parity

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

geskiedenis

Ontdek deurGustov Kirchoff, Robert Bunsen
ligging van ontdekkingGermany
ontdekkingsdatum1860
etimologieLatin: coesius (sky blue); for the blue lines of its spectrum.
uitspraakSEE-zi-em (Engels)

source

Abundance
Abundance in Earth's crust
natural abundance (oseaan)
0,0003 mg/L
natural abundance (human body)
0,000002 %
natural abundance (Meteoroïde)
0,000014 %
natural abundance (Son)
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