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73
Ta
180.95
Tantalum
Transition metals · Group 5 · Period 6
Atomic properties
| Atomic number | 73 |
|---|---|
| Symbol | Ta |
| Standard atomic weight | 180.95 |
| Classification | Transition metals |
| Group | 5 |
| Period | 6 |
| Block | d-block |
| Electron configuration | [Xe] 4f14 5d3 6s2 |
| Electronegativity (Pauling) | 1.50 |
| Common oxidation states | +5 |
Physical properties
| Phase at 20 °C | Solid |
|---|---|
| Density | 16.69 g/cm³ |
| Melting point | 3017 °C |
| Boiling point | 5458 °C |
| Discovered | 1802 |
| CAS number | — |