Arsenic vs Niobium

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PropertyAs ArsenicNb Niobium
Atomic number3341
SymbolAsNb
NameArsenicNiobium
Categorymetalloidtransition-metal
Standard Atomic Weight74.921595 u92.90637 u
Period45
Group155
Blockps
Phase at STPsolidsolid
Electron configuration[Ar]4s23d104p3[Kr]5s14d4
Oxidation states[-3, -2, -1, 0, 1, 2, 3, 4, 5][-3, -1, 0, 1, 2, 3, 4, 5]
Electronegativity (Pauling)2.181.6
Electron affinity0.81 eV0.893 eV
Density5776 kg/m³8570 kg/m³
Melting point816.85 °C2476.85 °C
Boiling point613.85 °C4743.85 °C
Discovery year12501801