Niobium was discovered by the English chemist Charles Hatchett in 1801.
Name: Niobium
Symbol: Nb
Atomic number: 41
Atomic weight: 92.906
State: solid
Group, period, block: 5, 5, d
Color: gray metallic, bluish when oxidized
Classification: transition metal
Electron configuration: 4d4 5s1
2,8,18,12,1
Physical properties
Density: 8.57 g/cm-3
Melting point: 2750 K,2477 °C,4491 °F
Boiling point: 5017 K,4744 °C,8571 °F
Atomic properties
Oxidation states: 5, 4, 3, 2, -1
Electronegativity: 1.86 (Pauling scale)
Ionization energies: 1st: 652.1 kJ·mol-1
Covalent radius: 164±6 pm
Van der Waals radius: no data
- Nb
Electron Configuration
Isotopes
There is one naturally occurring isotope of niobium exists, 93Nb.