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Tantalum


6
73
180.9479
KEY
Chemical Element Symbol Key

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Tantalum
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Symbol: Ta
Atomic Number: 73
Atomic Weight: 180.9479
Element Classification: Transition Metal
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 (@20°C J/g mol): 0.140
Fusion Heat (kJ/mol): 24.7
Evaporation Heat (kJ/mol): 758
Thermal Conductivity (@25°C W/m K):
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 (Å): 3.310
Lattice C/A Ratio: n/a


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