PERIODIC ELEMENT
Ta (Tantalum)

 



Atomic number : 73
Atomic mass : 180.95 g.mol-1
Electronegativity according to Pauling : 1.5
Density : 16.69 g.cm-3 at 20 °C
Melting point : 2850 °C
Boiling point : 6000 °C
Vanderwaals radius : 0.1425 nm
Ionic radius : 0.070 nm (+5)
Isotopes : 4
Electronic shell : [Xr] 4f14 5d3 6s2
Energy of first ionisation : 674.2 kJ.mol-1
Discovered by : Anders Ekeberg in 1802
 
Atomic Structure Uses (capacitors, camera lenses)