| Niobium ✕ | |
|---|---|
| Symbol | Nb |
| Atomic number | 41 |
| Chemical property | Transition metal |
| Origin o the name | Niobe, daughter of king Tantalus from Greek mythology |
| Group | 5 |
| Period | 5 |
| Atomic weight (u) | 92.90637 |
| Atomic weight uncertainty (u) | 0.00002 |
| Density (g/cm³) | 8.57 |
| Melting point (K) | 2750 |
| Boiling point (K) | 5017 |
| Heat capacity (J/(g·K)) | 0.265 |
| Electro-negativity | 1.6 |
| Abundance in earth's crust (mg/kg) | 20 |