Science Periodic Table - Elements - Tantalum Symbol Ta Atomic Number 73 Relative Atomic Mass 12C = 12.0000 180.9479 Atomic Radius pm 143 First Ionisation Energy kJ mol-1 761 Electronegativity 1.5 Density kg m-3 16654 [293 K] 15000 [l., m.p.] Molar Volume cm3 10.87 Thermal Conductivity W m-1 K-1 57.5 [300 K] Melting Point K 3269 Boiling Point K 5698 ± 100 Number of Isotopes 28 Ground State Electron Configuration [Xe]4f145d36s2 Term Symbol 4F3/2 Discovery Discovered by A.G. Ekeberg (Uppsala, Sweden) in 1802 Name Derived From Greek Tantalos from Greek mythology Name in Other Languages  Croatian Tantal  Danish tantal  Dutch tantaal  Finnish tantaali  French tantale  German Tantal  Italian tantalio  Norwegian tantal  Portuguese tântalo  Spanish tántalo  Swedish tantal Peter van der Krogt's Element Multidict - element name translations in over 48 langauges

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