Science Periodic Table - Elements - Terbium Symbol Tb Atomic Number 65 Relative Atomic Mass 12C = 12.0000 158.92534 Atomic Radius pm 178 First Ionisation Energy kJ mol-1 564.6 Electronegativity n/a Density kg m-3 8229 [293 K] Molar Volume cm3 19.31 Thermal Conductivity W m-1 K-1 11.1 [300 K] Melting Point K 1629 Boiling Point K 3396 Number of Isotopes 31 Ground State Electron Configuration [Xe]4f96s2 Term Symbol 6H15/2 Discovery Discovered by C.G. Mosander (Stockholm, Sweden) in 1843 Name Derived From Named after Ytterby, Sweden Name in Other Languages  Croatian Terbij  Danish terbium  Dutch terbium  Finnish terbium  French terbium  German Terbium  Italian terbio  Norwegian terbium  Portuguese térbio  Spanish terbio  Swedish terbium Peter van der Krogt's Element Multidict - element name translations in over 48 langauges

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