Tantalum

Transition metal · 180.9479 u · group 5, period 6

Tantalum · Ta

Atomic number73

SymbolTa

CategoryTransition metal

Standard stateSolid

Group · Period · Block5 · 6 · d

Electron configuration[Xe]6s2 4f14 5d3

Atomic mass180.9479 u

Atomic radius217 pm

Protons / Neutrons / Electrons73 / 108 / 73

Shells (e⁻ per shell)2, 8, 18, 32, 11, 2

Electronegativity (Pauling)1.5

Ionization energy7.89 eV

Electron affinity0.322 eV

Oxidation states+5

Melting point3.29e+3 K · 3.02e+3 °C

Boiling point5.73e+3 K · 5.46e+3 °C

Density16.4 g/cm³

Year discovered1802

CPK color

#4DA6FF

State at room temp (25 °C)

solid

Position