Science Periodic Table - Elements - Rubidium Symbol Rb Atomic Number 37 Relative Atomic Mass 12C = 12.0000 85.4678 Atomic Radius pm 247.5 First Ionisation Energy kJ mol-1 403.0 Electronegativity 0.82 Density kg m-3 1532 [293 K] 1475 [l., m.p.] Molar Volume cm3 55.79 Thermal Conductivity W m-1 K-1 58.2 [300 K] Melting Point K 312.2 Boiling Point K 961 Number of Isotopes 30 Ground State Electron Configuration [Kr]5s1 Term Symbol 2S1/2 Discovery Discovered by R.W. Bunsen and G. Kirchhoff (University of Heidelberg, Germany) in 1861 Name Derived From Latin rubidius meaning 'deepest red' Name in Other Languages  Croatian Rubidij  Danish rubidium  Dutch rubidium  Finnish rubidium  French rubidium  German Rubidium  Italian rubidio  Norwegian rubidium  Portuguese rubídio  Spanish rubidio  Swedish rubidium Peter van der Krogt's Element Multidict - element name translations in over 48 langauges

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