Tantalum

Symbol TaAtomic number 73
Atomic mass
180.947
 Thermal conductivity
0.55
Atomic radius
2.09
 Covalent radius
1.34
Density
16.6
 Atomic volume
10.9
Melting point
3270
 Oxidation states
5
Boiling point
5731
 Stable isotopes
1
Heat of vapor.
743
 Electronegativity
1.5
Heat of fusion
31.6
 First ionization
7.89
Specific heat
0.14
 Electrical conduct.
...
Electron configuration
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Tantalum

Tantalum and Niobium commonly occur together in the iron -containing minerals columbite (FeNb2O6) and tantalite (FeTa2O6). Tantalum with niobium, manganese and iron form the oxides manganocolumbite and manganotantalite. Tantalum is found with calcium, solium and fluorine in the oxide mineral microlite. Tantalum is found with uranium, yttrium, cerium and titanium in the complex oxide mineral euxenite.

Tantalum carbide, TaC, is a very hard substance which is used for making high-speed cutting tools.

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Tantalum Nuclear Data

Z
A
Atomic
Mass (u)
Nuclear
Mass(GeV/c2
Binding
Energy(MeV)
Spin
Natural
Abund.
Half-life
Decay
Q
MeV
73
179
178.945930
166.6511
1438.0
7/2
...
1.82y
EC
0.11
73
180
179.947462
167.5840
1444.7
1
...
18.15h
EC,b-
0.87,0.71
73
181
180.947993
168.5160
1452.3
7/2
0.99998
stable
...
...
73
182
181.950148
169.4496
1458.3
3
...
115d
b-
1.81
Atomic data
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