Niobium |
| Simbool | Nb |
|---|---|
| Latynse naam | Niobium |
| Atoomgetal | 41 |
| Periode | 5 |
| Element kategorie | Oorgangselemente |
| Relatieve atomiese massa | 92.90638 |
| Groep | V.B |
| Electronegativiteit | 1.6 |
| Oksidering nommers | 3, 5 |
| Elektronkonfigurasie | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d4 5s1 |
| Digtheid [g/cm3] | 8.57 |
| Staat | Vaste stof |
| Smeltpunt [°C] | 2468 |
| Kookpunt [°C] | 4742 |
| Atoomradius [pm] | 198 |
| Covalent radius [pm] | 137 |
| Termiese geleidingsvermoë [W m-1K-1] | 53.7 |
| Hitte kapasiteit [J K-1g-1] | 0.265 |
| Ontdekking | 1801 |
| Hardheid [Mohs-skaal] | 6.0 |
| Vickers se hardheid [MPa] | 1320 |
| Brinell-hardheid [MPa] | 736 |
| Young's modulus [GPa] | 105 |
| Elektriese geleiding [S m-1] | 6.7 · 106 |
| Shear modulus [GPa] | 38 |
| 1ste ionisasie-energie [eV] | 6.7589 |
| 2de ionisasie-energie [eV] | 14.32 |
| 3de ionisasie-energie [eV] | 25.04 |
| Stabiele isotope | 1 |
| Onstabiele isotope | 21 |