Tantalum
Symbol
Ta
Atomic Number
73
Atomic Weight
180.9479
Element Classification
Discovered By
Anders Ekeberg
Discovery Date
1802 (Sweden)
Name Origin
King Tantalus of Greek mythology, father of Niobe.
Density (g/cc)
16.654
Melting Point (K)
3269
Boiling Point (K)
5698
Appearance
Gray, heavy, hard metal
Atomic Radius (pm)
149
Atomic Volume (cc/mol)
10.9
Covalent Radius (pm)
134
Ionic Radius
68 (+5e)
Specific Heat
0.140
Fusion Heat (kJ/mol)
24.7
Evaporation Heat (kJ/mol)
758
Thermal Conductivity (@25°C W/m K)
57.5
Debye Temperature (K)
225.00
Pauling Negativity Number
1.5
First Ionizing Energy (kJ/mol)
760.1
Oxidation States
5
Electronic Configuration
[Xe] 4f14 5d3 6s2
Lattice Structure
Body-Centered Cubic(BCC)
Lattice Constant
3.310
Lattice C/A Ratio
n/a
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