Symbol Nb Atomic radius: pm 143 Fusion: kJ/Mole 30.0
Name Niobium Ionic radius: pm (+5)64 Boiling point: C 4744
Atomic number 41 Electron affinity 0.90 Melting point: C 2477
Atomic weight 92.91 1st  ion potential 6.76 Specific Heat Cap: J/(g K) 0.27
Classification Trans metal Natural form Solid Thermal Cond: W/(cm K) 0.54
Configuration [Kr]4d45s1 Crystal structure BCC Electrical Cond 0.0693
Oxidation states 5,3 Density 8.57 Abundance: mg/kg-crust 20
Electronegativity 1.60 Vaporization: kJ/Mole 696.6    
Charles Hatchet first discovered Niobium in 1801, and he named it columbium.  It was then rediscovered in 1844 by Heinrich Rose, and he gave it the name of niobium. Uses - stainless steel, magnets