Science Periodic Table - Elements - Thallium Symbol Tl Atomic Number 81 Relative Atomic Mass 12C = 12.0000 204.3833 Atomic Radius pm 170 First Ionisation Energy kJ mol-1 589.3 Electronegativity n/a Density kg m-3 11850 [293 K] 11290 [l., m.p.] Molar Volume cm3 17.24 Thermal Conductivity W m-1 K-1 46.1 [300 K] Melting Point K 576.7 Boiling Point K 1730 Number of Isotopes 41 Ground State Electron Configuration [Xe]4f145d106s26p1 Term Symbol 2P1/2 Discovery Discovered by W. Crookes (London, England) in 1861 and isolated by C.A. Maly (Paris, France) in 1862 Name Derived From Greek thallos meaning 'green twig' Name in Other Languages  Croatian Talij  Danish thallium  Dutch thallium  Finnish tallium  French thallium  German Thallium  Italian tallio  Norwegian thallium  Portuguese tálio  Spanish talio  Swedish tallium Peter van der Krogt's Element Multidict - element name translations in over 48 langauges

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