Element: Cesium (Cs)

Element (Atom) NameCesium
Physical state at room temperatureSolid
Element ClassificationMetal
Group NameAlkali Metal
Group number (Periodic table)1
Period Number (Periodic table) 6
Atomic number55
Atomic Weight132.90545196 (Ref: Jlab-ele055, Ciaaw-caesium)
132.9 (Ref: Lanl-55)
Atomic Radius343 pm (Van der Waals) (Ref: Lanl-55)
Density1.93 g/cm3 (Ref: Jlab-ele055)
Melting point28.44°C (Ref: Jlab-ele055)
Boiling point671°C (Ref: Jlab-ele055)
Electron shell configuration1s2 
2s2 2p6 
3s2 3p6 3d10 
4s2 4p6 4d10 
5s2 5p6 6s1
Oxidation States+1 (Ref: Jlab-ele055)+1, −1 (a strongly basic oxide) (Ref: Lanl-55)
Ionization Energy3.894 eV (Ref: Jlab-ele055)
3.89390572743 eV (Ref: Nist-55)
Number of Stable Isotopes1
InChI1S/Cs (Ref: Pubchem-55)

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