Science Periodic Table - Elements - Radium Symbol Ra Atomic Number 88 Relative Atomic Mass 12C = 12.0000 226.0254 (226Ra) Atomic Radius pm 223 First Ionisation Energy kJ mol-1 509.3 Electronegativity 0.89 Density kg m-3 c. 5000 [293 K] Molar Volume cm3 45.2 Thermal Conductivity W m-1 K-1 18.6 [300 K] (est.) Melting Point K 973 Boiling Point K 1413 Number of Isotopes 25 Ground State Electron Configuration [Rn]7s2 Term Symbol 1S0 Discovery Discovered by P. Curie and M. Curie (Paris, France) in 1898. Isolated by M. Curie in 1911 Name Derived From Latin radius meaning 'ray' Name in Other Languages  Croatian Radij  Danish radium  Dutch radium  Finnish radium  French radium  German Radium  Italian radio  Norwegian radium  Portuguese rádio  Spanish radio  Swedish radium Peter van der Krogt's Element Multidict - element name translations in over 48 langauges

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