Science Periodic Table - Elements - Einsteinium Symbol Es Atomic Number 99 Relative Atomic Mass 12C = 12.0000 252.083 (252Es) Atomic Radius pm 203 First Ionisation Energy kJ mol-1 619 Electronegativity 1.3 Density kg m-3 n/a Molar Volume cm3 n/a Thermal Conductivity W m-1 K-1 10 [300 K] (est.) Melting Point K 1130 ± 30 Boiling Point K n/a Number of Isotopes 17 Ground State Electron Configuration [Rn]5f117s2 Term Symbol 5I15/2 Discovery Discovered by G.R. Choppin, S.G. Thompson, A. Ghiorso and B.G. Harvey in the deris of the thermonuclear explosion in the Pacific in 1952 Name Derived From Named after Albert Einstein Name in Other Languages  Croatian Einsteinij  Danish einsteinium  Dutch einsteinium  Finnish einsteinium  French einsteinium  German Einsteinium  Italian einsteinio  Norwegian einsteinium  Portuguese einstānio  Spanish einsteinio  Swedish einsteinium Peter van der Krogt's Element Multidict - element name translations in over 48 langauges

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