de en fr hr it es
Neighborhood
Zr
40
Nb
41
Mo
42
Hf
72
Ta
73
W
74
Rf
104
Db
105
Sg
106

 

Periodic table

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Tantal

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Tantalum

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Tantale

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Tantal

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Tantalio

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Tántalo

 

Ta
Ta
Tantal

PERIODIC TABLE OF THE ELEMENTS

TANTALUM

TRANSITION ELEMENT:
VANADIUM GROUP

 

Atomic number:73

Group numbers:5

Period:6

Electronic configuration:[Xe] 4f14 5d3 6s2

Formal oxidation number:+5

Electronegativities:1.5

Atomic radius / pm:143

Relative atomic mass:180.94788 ± 0.00002

 

Tantalum was discovered by Anders Gustaf Ekeberg (SE) in 1802. The origin of the name comes from the Greek word Tantalos meaning father of Niobe in Greek mythology, (tantalum is closely related to niobium in the periodic table). It is a rare, grey, heavy, hard but ductile, metal with a high melting point that reacts with HF and fused alkalis. Metal ignites in air and exposed surfaces form corrosion resistant oxide film. Tantalum is always found with niobium but occurs chiefly in the mineral tantalite. It is often used as an economical substitute for platinum. Tantalum pentoxide is used in capacitors and in camera lenses to increase refracting power. It and its alloys are corrosion and wear resistant so it is used to make surgical and dental tools.

PHYSICAL PROPERTIES

Density / g dm-3:16654 (293 K)

 15000 (m.p.)

Molar volume / cm3mol-1:10.87 (293 K)

 12.06 (m.p.)

Electrical resistivity / μΩcm:13.15 (20 °C)

THERMAL PROPERTIES

Thermal conductivity / W m-1K-1:57.5

Melting point / °C:3017

Boiling point / °C:5458

Heat of fusion / kJ mol-1:31.4

Heat of vaporization / kJ mol-1:758.22

Heat of atomization / kJ mol-1:781.425

IONIZATION ENERGIES

First ionization energy / kJ mol-1:728.43

Second ionization energy / kJ mol-1:-

Third ionization energy / kJ mol-1:-

ABUNDANCE OF ELEMENTS

in the atmosphere / ppm:-

in the Earth's crust / ppm:1

in the oceans / ppm:0.0025

CRYSTALLOGRAPHIC DATA

body-centered cubic

Crystal structure:

body-centered cubic

Unit-cell dimensions / pm:

a=330.29

Space group:

Im3m

ISOTOPES

IsotopeRelative atomic massMass percent (%)
180Ta179.947466(3)0.012(2)
181Ta180.947996(3)99.988(2)

REDUCTION POTENTIALS

Balanced half-reaction Eo / V
Ta2O5 + 10H+ + 10e- = 2Ta(s) + 5H2O- 0.81

 

72 Hafnium <=
73 Tantalum
=> 74 Tungsten