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Tantalum (Ta)
Atomic number 73 · transition
| Atomic number | 73 |
|---|---|
| Atomic mass | 180.94788 u |
| Molar mass | 180.94788 g/mol |
| Category | transition |
| Group / period / block | 5 / 6 / d |
| Electron configuration | [Xe] 4f14 5d3 6s2 |
| Electrons per shell | 2, 8, 18, 32, 11, 2 |
| Electronegativity (Pauling) | 1.5 |
| Atomic radius | 145.0 pm |
| Density | 16.4 g/cm³ |
| First ionisation energy | 7.5496 eV |
| Melting point | 3290.15 K (3017.00 °C) |
| Boiling point | 5728.15 K (5455.00 °C) |
| Common oxidation states | +5 |
| Abundance in Earth's crust | 2 ppm |
Uses
Phone capacitors, surgical implants
Discovery
1802, Anders Ekeberg