Periodic Table of Elements




Tantalum was discovered by Anders Gustaf Ekenberg, a Swedish chemist, in 1802. The name tantalum was derived from the name of the mythological Tantalus, the father of Niobe in Greek mythology.

Name: Tantalum
Symbol: Ta
Atomic number: 73
Atomic weight: 180.95
State: solid
Group, period, block: 5, 6, d
Color: gray blue
Classification: transition metal
Electron configuration: 4f14 5d3 6s2

Physical properties

Density: 16.69 g/cm-3
Melting point: 3290 K, 3017 C, 5463 F
Boiling point: 5731 K, 5458 C, 9856 F

Atomic properties

Oxidation states: 5, 4, 3, 2, -1
Electronegativity: 1.5 (Pauling scale)
Ionization energies: 1st: 761 kJmol-1
Covalent radius: 1708 pm
Van der Waals radius: no data
  • Ta
  • Electron Configuration


There are two naturally occurring isotopes of tantalum exist, 180Ta, and i81Ta.