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Atomic number 80 Atomic mass 200.59 g.mol -1 Electronegativity according to Pauling 1.9 Density13.6 g.cm-3 at 20°C Melting point - 38.9 °C Boiling point 356.6 °C Vanderwaals radius 0.157 nm Ionic radius 0.11 nm (+2) Isotopes 12 Electronic shell[ Xe ] 4f14 5d10 6s2 Energy of first ionisation 1004.6 kJ.mol -1 Energy of second ionisation 1796 kJ.mol -1 Energy of third ionisation 3294 kJ.mol -1 Standard potential + 0.854 V ( Hg2+/ Hg ) Discovered by The ancients

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