
Periodic Table  | Tantalum | Symbol | Ta | | Atomic Number | 73 | Relative Atomic Mass 12C = 12.0000 | 180.9479 | | Atomic Radius pm | 143 | First Ionisation Energy kJ mol -1 | 761 | | Electronegativity | 1.5 | Density kg m -3 | 16654 [293 K] 15000 [l., m.p.] | | Molar Volume cm 3 | 10.87 | Thermal Conductivity W m -1 K -1 | 57.5 [300 K] | | Melting Point K | 3269 | | Boiling Point K | 5698 ± 100 | | Number of Isotopes | 28 | | Inner/outer Shells | | | Inner/outer Orbitals | | | Filling Orbital | | Ground State Electron Configuration | | Ground State Electron Configuration with free Orbitals (n= 13) |  | Ground State Electron Configuration with compressed Orbitals (n= 96) |  | | | Singularity | | | | | s | p | d | f | g | h | i | j | 1 | 2 | | | | | | | | 2 | 2 | 6 | | | | | | | 3 | 2 | 6 | 10 | | | | | | 4 | 2 | 6 | 10 | 14 | | | | | 5 | 2 | 6 | 3 | 7 | 14 | 18 | | | | 6 | 2 | 6 | 10 | 14 | 18 | 22 | | | 7 | | | | | | | | | 8 | | | | | | | | |
| | | | Term Symbol | 4 F 3/2 | | Discovery | Discovered (1802) by the Swedish chemist Anders Gustaf Ekeberg (Uppsala, Sweden) | | Name Derived From | named after the Greek mythological character Tantalus or Tantalos because of the tantalizing problem of dissolving the oxide in acids. |
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