Atomic Element Z = 41 • Transition Metal
Niobium (Nb) — Atomic Data, Electron Shells & Reactions
Niobium (symbol Nb, atomic number 41) has a standard atomic weight of 92.906 u and ground-state configuration [Kr] 4d4 5s1.
Atomic Number (Z)
41
IUPAC Symbol
Nb
Standard Atomic Weight
92.906 g/mol
Period / Group / Block
5 / 5 / d-block
Condensed Electron Config
[Kr] 4d4 5s1
Full Subshell Config
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d4 5s1
Principal Shell Occupancy
[2, 8, 18, 12, 1]
Pauling Electronegativity
1.6
First Ionization Energy
652 kJ/mol
Covalent Radius
164 pm
Melting Point
2750 K (2476.85 °C)
Boiling Point
5017 K (4743.85 °C)
Density
8.57 g/cm³
Oxidation States
+5, +3
Nb (Z=41) — Valence shell highlighted in vermilion