Niobium
| Nb |
Niobium |
Transition Metal |
| Atomic number: |
41 |
|
Atomic weight: |
92.90638 |
|
| Shells: |
2,8,18,12,1 |
|
Orbitals: |
[Kr] 4d4 5s1 |
|
| Melting point: |
2468°C ±10°C |
|
Boiling point: |
4742°C |
|
| Covalent radius: |
1.34 |
Å |
Atomic volume: |
10.87 |
cm³/mol |
| Atomic radius: |
2.08 |
Å |
Ionic radius: |
.64 (+5) |
Å |
| Electronegativity: |
1.6 |
|
Oxidation states: |
(5),3 |
|
| 1st ionization pot.: |
6.7589 |
V |
2nd ionization pot.: |
14.32 |
V |
| 3rd ionization pot.: |
25.04 |
V |
Specific heat: |
0.26 |
J/gK |
| Heat of fusion: |
26.40 |
kJ/mol |
Heat of vapor.: |
682.0 |
kJ/mol |
| Thermal conduct.: |
0.537 |
W/cmK |
Electrical conduct.: |
0.0693 |
10^6/cm ohm |
| Density: |
8.57 |
g/cm³ |
Valence: |
2,3,5 |
|
