| Element | Niobium | Symbol | Nb |
| Atomic Number | 41 | Molar Mass | 92.91 gmol-1 |
| Electron Configuration | [Kr]4d45s1 | Normal State | solid metal |
| Density @STP | 8.57 g cm-3 | Melting Point | 2477oC |
| Boiling Point | 4744oC | Stable Isotopes | 93Nb |
| Atomic Radius | 147 pm | Ionic Radius | 69 (5+) pm |
| Electronegativity (Pauling) | 1.6 | Ionization Energy (1st) | 664 kJ mol-1 |
| Ionization Energy (2nd) | 1382 kJ mol-1 | Ionization Energy (3rd) | 2416 kJ mol-1 |
| Molar Heat Capacity | 24.6 J K-1mol-1 | Standard Molar Entropy | 36.4 J K-1mol-1 |
| Enthalpy of Fusion | 27.2 kJ mol-1 | Enthalpy of Vapourization | 696.6 kJ mol-1 |