Technetium

ElementTechnetiumSymbolTc
Atomic Number43Molar Mass98.91 gmol-1
Electron Configuration[Kr]4d55s2Normal Statesolid metal
Density @STP11.5 g cm-3Melting Point2157oC
Boiling Point4265oCStable Isotopesnone
Atomic Radius135 pmIonic Radius97 (4+) pm
Electronegativity (Pauling)1.9Ionization Energy (1st)702 kJ mol-1
Ionization Energy (2nd)1472 kJ mol-1Ionization Energy (3rd)2850 kJ mol-1
Molar Heat Capacity20.8 J K-1mol-1Standard Molar Entropy181.1 J K-1mol-1
Enthalpy of Fusion23.81 kJ mol-1Enthalpy of Vapourization585.22 kJ mol-1
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