Tantalum
Symbol: Ta
Atomic Number: 73
Atomic Weight: 180.9479
Boiling Point: 5730 K
Melting Point: 3293 K
Density at 300K: 16.65 g/cm³
Covalent radius: 1.34
Atomic radius: 2.09
Atomic volume: 10.90 cm³/mol
First ionization potental: 7.89 V
Specific heat capacity: 0.14 Jg^-1K^-1
Thermal conductivity: 57.5 Wm^-1K^-1
Electrical conductivity: 8.1*10⁶Ω^-1m^-1
Heat of fusion: 36 kJ/mol
Heat of vaporization: 373.0 kJ/mol
Electronegativity: 1.5 (Pauling's)

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Some uses for Tantalum:

Tantalum wire is used as a filament for evaporating aluminum.

Tantalum's extremely high melting point and hardness make it favorable for high-grade steels used in missiles and aircraft.

Tantalum is extremely resistant to corrosion and chemical reactions below 150 degrees C, and is used in medical applications such as bone repair and reinforcement.

Tan"ta*lum (?), n. [NL. So named on account of the perplexity and difficulty encounterd by its discoverer (Ekeberg) in isolating it. See Tantalus.] Chem.

A rare nonmetallic element found in certain minerals, as tantalite, samarskite, and fergusonite, and isolated as a dark powder which becomes steel-gray by burnishing. Symbol Ta. Atomic weight 182.0. Formerly called also tantalium.

 

© Webster 1913.