Science Periodic Table - Elements - Hafnium Symbol Hf Atomic Number 72 Relative Atomic Mass 12C = 12.0000 178.49 Atomic Radius pm 156 First Ionisation Energy kJ mol-1 642 Electronegativity 1.3 Density kg m-3 13310 [293 K] 12000 [m.p.] Molar Volume cm3 13.41 Thermal Conductivity W m-1 K-1 23.0 [300 K] Melting Point K 2503 Boiling Point K 5470 Number of Isotopes 33 Ground State Electron Configuration [Xe]4f145d26s2 Term Symbol 3F2 Discovery Discovered by D. Coster and G.C. von Hevesey (Copenhagen, Denmark) in 1923 Name Derived From Latin Hafnia meaning 'Copenhagen' Name in Other Languages  Croatian Hafnij  Danish hafnium  Dutch hafnium  Finnish hafnium  French hafnium  German Hafnium  Italian hafnio  Norwegian hafnium  Portuguese háfnio  Spanish hafnio  Swedish hafnium Peter van der Krogt's Element Multidict - element name translations in over 48 langauges

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