Stable isotope Niobium (Nb)

Isotope Z(p) N(n) Atomic Mass Natural Abundance Nuclear Spin
Nb-93 41 52 92.906376 100% 9/2+
 

Properties of Niobium

Name Niobium
Symbol Nb
Atomic number 41
Atomic weight 92.906
Standard state Solid at 298 °K
CAS Registry ID 7440-03-1
Group in periodic table 5
Group name None
Period in periodic table 5
Block in periodic table d-block
Color Gray metallic
Classification Metallic
Melting point 2468 °C
Boiling point 4742 °C
Thermal conductivity 53.7 W/(m·K) at 298.2 °K
Electrical resistivity 12.5 µΩ·cm at 0 °C
Electronegativity 1.6
Specific heat 0.27 kJ/kg K
Heat of vaporization 689.9 kJ·mol-1
Heat of fusion 26.8 kJ·mol-1
Density of solid 8.57 g/cm3
Electron configuration [Kr]4d45s1 
Atomic radius 1.47 Å
Ionic radius Nb5+: 0.68 Å
Atomic volume 10.8 cm3/mol
Oxidation states +3, +4, +5
Most common oxidation state +5