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
