Caesium (Cesium)

ElementCaesiumSymbolCs
Atomic Number55Molar Mass132.91 gmol-1
Electron Configuration[Xe]6s1Normal Statesolid metal
Density @STP1.879 g cm-3Melting Point28.4oC
Boiling Point671oCStable Isotopes133Cs
Atomic Radius272 pmIonic Radius169 (1+) pm
Electronegativity (Pauling)0.79Ionization Energy (1st)376 kJ mol-1
Ionization Energy (2nd)2234 kJ mol-1Ionization Energy (3rd)3400 kJ mol-1
Molar Heat Capacity32.2 J K-1mol-1Standard Molar Entropy85.2 J K-1mol-1
Enthalpy of Fusion2.09 kJ mol-1Enthalpy of Vapourization65.9 kJ mol-1
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