Tantalum Physical & General Properties
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				[ Xe ] 4f14 5d3 6s2
Energy of first ionisation				674.2 kJ.mol -1
Discovered by				Anders Ekeberg in 1802