Niobium vs Barium

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PropertyNb NiobiumBa Barium
Atomic number4156
SymbolNbBa
NameNiobiumBarium
Categorytransition-metalalkaline-earth-metal
Standard Atomic Weight92.90637 u137.327 u
Period56
Group52
Blockss
Phase at STPsolidsolid
Electron configuration[Kr]5s14d4[Xe]6s2
Oxidation states[-3, -1, 0, 1, 2, 3, 4, 5][1, 2]
Electronegativity (Pauling)1.60.89
Electron affinity0.893 eV0.1447 eV
Density8570 kg/m³3620 kg/m³
Melting point2476.85 °C726.85 °C
Boiling point4743.85 °C1896.85 °C
Discovery year18011808