Periodic Table
41
Nb
92.906
Niobium
Transition MetalSuperconducting alloys; config exception (4d⁴5s¹).
Electronic Configuration
[Kr] 4d⁴ 5s¹or1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 4d⁴ 5s¹
Electron shells
2e⁻n=1
8e⁻n=2
18e⁻n=3
12e⁻n=4
1e⁻n=5
Properties
Atomic number
41
Atomic mass
92.906 u
Category
Transition Metal
Block / Group / Period
d · 5 · 5
Valence electrons
1
Oxidation states
+3, +5
Electronegativity
1.6
Atomic radius
198 pm
Ionization energy
652 kJ/mol
Electron affinity
86 kJ/mol
Melting point
2750 K / 2477 °C
Boiling point
5017 K / 4744 °C
Density
8.57 g/cm³
State at 25 °C
solid
Personal Notes
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