Niobium                                            
 

Atomic Number (# of protons)

41

Mass (amu)

92.91

Density

8.57 g/cm3 (200C, 1 atm)

Electron Configuration

[Kr]4d45s1

Oxidation States (bold = most stable)

+5,3

Atomic Radius (pm)

143

Ionic Radius (pm)

(+4)84

Electronegativity

1.2

Melting Point (0C, 1 atm)

2469

Electron Affinity (eV)

0.90

Boiling Point(0C, 1 atm)

4744

1st Ionization energy (eV)

6.76

Enthalpy of Fusion (kJ/mole)

27.2

2nd Ionization Energy (eV)

Enthalpy of Vaporization (kJ/mole)

696.6

3rd Ionization Energy (eV)

Specific Heat Capacity ( J/ (g K), 250C, 1 atm)

0.27

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