Science Periodic Table - Elements - Caesium Symbol Cs Atomic Number 55 Relative Atomic Mass 12C = 12.0000 132.90543 Atomic Radius pm 265.4 First Ionisation Energy kJ mol-1 375.7 Electronegativity 0.79 Density kg m-3 1873 [293 K] 1843 [m.p.] Molar Volume cm3 70.96 Thermal Conductivity W m-1 K-1 35.9 [300 K] Melting Point K 301.55 Boiling Point K 951.6 Number of Isotopes 40 Ground State Electron Configuration [Xe]6s1 Term Symbol 2S1/2 Discovery Discovered by R. Bunsen and G.R. Kirchhoff (Heidelberg, Germany) in 1860 Name Derived From Latin caesius meaning 'sky blue' Name in Other Languages  Croatian Cezij  Danish caesium  Dutch cesium  Finnish cesium  French césium  German Caesium  Italian cesio  Norwegian cesium  Portuguese césio  Spanish cesio  Swedish cesium  US cesium Peter van der Krogt's Element Multidict - element name translations in over 48 langauges

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