Discovered By: Charles Hatchett
Discovery year: 1802

The following table showing some properties of Tantalum(Ta):

Table Example
Atomic number 73
Group 5
Period 6
Block d
Electrons 73
Protons 73
Neutrons 108
Atomic weight 180.94788
Oxidation states +5
Ionic charge Ta^5+


Table Example
Electrons per shell K2 L8 M18 N32 O11 P2
Electron configuration 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10 5p^6 6s^2 4f^14 5d^3
Atomic radius 200 pm
Covalent radius 170 pm
Boiling point 5458°C
Melting point 3017°C
Phase Solid
Fusion heat 36 kJ.mol^-1
Thermal expansion 6.3*10^-6 K^-1
Vaporization heat 735 kJ.mol^-1


Table Example
Color Gray
Brinell hardness 800 MPa
Bulk modulus 200 GPa
Density 16650 kg.m^-3
Liquid density 15000 kg.m^-3
Mohs hardness 6.5
Poisson ratio 0.34
Shear modulus 69 GPa
Sound speed 3400 m.s^-1
Vickers hardness 873 MPa


Table Example
Young's modulus 186 GPa
Electric type Conductor
Magnetic type Paramagnetic
Resistivity 1.3*10^-7 Ohm.m
Superconducting point 4.47 K
Electronegativity 1.5
Valence 5
Electron affinity 31 kJ.mol^-1
First ionization energy 761 kJ.mol^-1
Radioactive No
Neutron cross section 20.5 barn