Periodic table of the elements
XenonCaesiumBarium
55
Cs
Caesium
132.9054519
2
8
18
18
8
1
55
Cs
Caesium
132.9054519
2
8
18
18
8
1
General
NameCaesium
SymbolCs
Number55
Chemical seriesAlkali metals
Group / Period1 / 6
Blocks-block
CAS registry number7440-46-2

Physical properties
Statesolid
Density1.93 g/cm3
Melting point301.59 K (28.44°C, 83.19°F)
Boiling point944 K (671 °C, 1240 °F)
Critical point1938 K, 9.4 MPa

Atomic properties
Atomic Weight132.9054519 g/mol
Crystal structurecubic body centered
Electronegativity0.79
Atomic radius260 pm
Atomic radius (calculated)298 pm
Electron configuration[Xe] 6s1
Electrons per shell2, 8, 18, 18, 8, 1
Number of protons55
Number of neutrons78

Other languages
SpanishCesio
PortugueseCésio
FrenchCésium
GermanCaesium
ItalianCesio
RussianЦезий
PolishCez
Chinese
Arabicسيزيوم
TurkishSezyum
DutchCesium


Periodic table of the elements
XenonCaesiumBarium