Tantalum (Ta)

From Wikipedia, the free encyclopediaTantalum is a chemical element with symbol Ta and atomic number 73. Previously known as tantalium, its name comes from Tantalus, an antihero from Greek mythology. Tantalum is a rare, hard, blue-gray, lustrous transition metal that is highly corrosion-resistant.

Tantalum in the periodic table

SymbolTa
Atomic number73
Group5
Period6
Blockd
Element categoryTransition Metal

Physical properties

Phase at STPSolid
Density16.69 g/cm3
Atomic weight180.948 u
Melting point3290 K
3016.85 °C
5462.33 °F
Boiling point5731 K
5457.85 °C
9856.13 °F

Atomära egenskaper

Electronegativity (Pauling Scale)1.5
Electron affinity31 kJ/mol
Ionization energies
1761 kJ/mol
2 1500 kJ/mol

Electron configuration

Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d3 6s2
Electrons per shell2, 8, 18, 32, 11, 2

History

Discovered1802
Discovered byAnders Gustaf Ekeberg