Tantalum

Symbol | Ta
Latin name | Tantalum
Atomic number | 73
Period | 6
Element category | Transition elements
Relative atomic mass | 180.9479
Group | V.B
Electronegativity | 1.5
Oxidation numbers | 5
Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d3 6s2
Density [g/cm3] | 16.654
State | Solid
Melting point [°C] | 2996
Boiling point [°C] | 5660
Atomic radius [pm] | 200
Covalent radius [pm] | 138
Thermal conductivity [W m-1K-1] | 57.5
Heat capacity [J K-1g-1] | 0.14
Discovery | 1802
Hardness [Mohs scale] | 6.5
Vickers hardness [MPa] | 873
Brinell hardness [MPa] | 800
Young's modulus [GPa] | 186
Electrical conductivity [S m-1] | 8.1 · 106
Shear modulus [GPa] | 69
1.st ionization energy [eV] | 7.89
Stable isotopes | 2
Unstable isotopes | 18