Latin name | Tantalum |
English name | Tantalum |
chemical symbol | Ta |
atomic number | 73 |
relative atomic mass | 180,9479 |
period | 6 |
group | V.B |
classification | transition metals |
discovery year | 1802 |
discoverer | A. G. Ekeberg |
melting point [°C] | 2996 |
boiling point [°C] | 5425 |
density [g cm-3] | 16,6 |
density at melting point [g cm-3] | 15,0 |
electronegativity [Pauling] | 1,5 |
oxidation states | II, III, IV, V |
electron configuration | [Xe]4f14 5d3 6s2 |
atomic radius [pm] | 200 |
covalent radius [pm] | 138 |
specific heat [J g-1K-1] | 0,14 |
heat of fusion [kJ mol-1] | 31,6 |
thermal conductivity [W m-1 K-1] | 57,5 |
el. conductivity [S m-1] | 8,1.106 |
1. ionizing potential [eV] | 7,89 |
Mohs hardness | 6,5 |
Vickers hardness [MPa] | 873 |
Brinell hardness [MPa] | 800 |
shear modulus [GPa] | 69 |
Young's modulus [GPa] | 186 |
point of superconductivity [K] | 4,47 |
state at normal conditions | solid |
Tantalum is a gray, heavy, and very hard metallic element.