Transition metal

Tantalum

Tantalum (Ta) has atomic number 73. PubChem classifies it as transition metal.

Atomic number

73

Symbol

Ta

Atomic weight (source value)

180.9479

Electron configuration

[Xe]6s2 4f14 5d3

Standard state

Solid

Electronegativity (Pauling)

1.5

Melting point (K)

3290

Boiling point (K)

5731

Density (g/cm³)

16.4

Oxidation states

+5

Understanding this entry

Atomic number is the number of protons in the nucleus. Properties are reference values and may depend on conditions and measurement conventions. An atomic weight is not the mass of every isotope. For elements without a standard atomic weight, a source may report an isotope mass number. Blank source values are shown as unavailable rather than estimated.

Further reading and reference: NIH PubChem source dataset ↗. Values and educational summaries are not a substitute for specialised advice.