Science Periodic Table - Elements - Dysprosium Symbol Dy Atomic Number 66 Relative Atomic Mass 12C = 12.0000 162.50 Atomic Radius pm 177 First Ionisation Energy kJ mol-1 571.9 Electronegativity 1.22 Density kg m-3 8550 [293 K] Molar Volume cm3 19.00 Thermal Conductivity W m-1 K-1 10.7 [300 K] Melting Point K 1685 Boiling Point K 2835 Number of Isotopes 24 Ground State Electron Configuration [Xe]4f106s2 Term Symbol 5I8 Discovery Discovered by P.É. Lecoq de Boisbaudran (Paris, France) in 1886 Name Derived From Greek dysprositos meaning 'hard to obtain' Name in Other Languages  Croatian Disprozij  Danish dysprosium  Dutch dysprosium  Finnish dysprosium  French dysprosium  German Dysprosium  Italian disprosio  Norwegian dysprosium  Portuguese disprósio  Spanish disprosio  Swedish dysprosium Peter van der Krogt's Element Multidict - element name translations in over 48 langauges

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