Home 41 Nb Niobium back to the periodic table
 
Atomic number   41
Symbol   Nb
Atomic weight   92.90638
Density [g/cm3]   8.85
Melting point [°C]   2468
Boiling point [°C]   4900
1st Ionization energy [eV]   6.88
Electronic configuration   [Kr] 4d4 5s
Oxidation number (most stable)   5, 3
Atomic radius [pm]   142.9
Ionic radius [pm]   64 (5+)
Abundance in crustal rocks [ppm]   20
Origin of the name   (greek) Niobe = daughter of Tantalus (tantalum is closely related to niobium in the periodic table
Discovery   1801 by Hatchett
Uses   as ferrous niobium or ferrous niobium tantalum for high-temperature resistant steel as well as Zr-Nb-alloys for the casing of core fuel rods. 
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 © 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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