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Nb - Niobium

A transition metal, discovered by Hatchett in 1801 in London. Niobium was formerly known as columbium.

 

Atomic number - 41 Density g/mL 8 .55
Atomic weight u 92 .9064 Melting point K 2740
Bonding radius A 1 .34 Boiling point K 5017
Atomic radius A 2 .08 Heat of vaporization kJ/mol 682
Ionization Potential V 6 .88 Heat of fusion kJ/mol 26 .4
Electronegativity - 1 .6 Specific heat J/gK 0 .26
The oxide is mildly acidic.
Crystal are body centered cubic.

Electron config. : [Kr] 4d4 5s1

 

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

H He
Li Be B C N O F Ne
Na Mg Al Si P S Cl Ar
K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
Cs Ba La* Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
Fr Ra Ac** Rf Db Sg Bh Hs Mt 110 111 112 113
Lanthanides* Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
Actinides ** Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr

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