Tellurium

ElementTelluriumSymbolTe
Atomic Number52Molar Mass127.6 gmol-1
Electron Configuration[Kr]4d105s25p4Normal Statesolid metalloid
Density @STP6.24 g cm-3Melting Point450oC
Boiling Point988oCStable Isotopes120Te, 122Te, 123Te, 124Te, 125Te, 126Te, 128Te, 130Te
Atomic Radius137 pmIonic Radius221 (2-) pm
Electronegativity (Pauling)2.1Ionization Energy (1st)869 kJ mol-1
Ionization Energy (2nd)1795 kJ mol-1Ionization Energy (3rd)2698 kJ mol-1
Molar Heat Capacity25.7 J K-1mol-1Standard Molar Entropy49.7 J K-1mol-1
Enthalpy of Fusion13.5 kJ mol-1Enthalpy of Vapourization50.63 kJ mol-1
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