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41
Nb
92.906
Niobium
Transition metals · Group 5 · Period 5
Atomic properties
| Atomic number | 41 |
|---|---|
| Symbol | Nb |
| Standard atomic weight | 92.906 |
| Classification | Transition metals |
| Group | 5 |
| Period | 5 |
| Block | d-block |
| Electron configuration | [Kr] 4d4 5s1 |
| Electronegativity (Pauling) | 1.60 |
| Common oxidation states | +5, +3 |
Physical properties
| Phase at 20 °C | Solid |
|---|---|
| Density | 8.57 g/cm³ |
| Melting point | 2477 °C |
| Boiling point | 4744 °C |
| Discovered | 1801 |
| CAS number | — |