Science Periodic Table - Elements - Barium Symbol Ba Atomic Number 56 Relative Atomic Mass 12C = 12.0000 137.327 Atomic Radius pm 217 First Ionisation Energy kJ mol-1 502.8 Electronegativity 0.89 Density kg m-3 3594 [293 K] 3325 [m.p.] Molar Volume cm3 38.21 Thermal Conductivity W m-1 K-1 18.4 [300 K] Melting Point K 1002 Boiling Point K 1910 Number of Isotopes 37 Ground State Electron Configuration [Xe]6s2 Term Symbol 1S0 Discovery Discovered by Sir H. Davey (London, England) in 1808 Name Derived From Greek barys meaning 'heavy' Name in Other Languages  Croatian Barij  Danish barium  Dutch barium  Finnish barium  French baryum  German Barium  Italian bario  Norwegian barium  Portuguese bário  Spanish bario  Swedish barium Peter van der Krogt's Element Multidict - element name translations in over 48 langauges

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