Beryllium vs Cobalt

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PropertyBe BerylliumCo Cobalt
Atomic number427
SymbolBeCo
NameBerylliumCobalt
Categoryalkaline-earth-metaltransition-metal
Standard Atomic Weight9.012183 u58.933194 u
Period24
Group29
Blockss
Phase at STPsolidsolid
Electron configuration[He]2s2[Ar]4s23d7
Oxidation states[0, 1, 2][-3, -1, 0, 1, 2, 3, 4, 5]
Electronegativity (Pauling)1.571.88
Electron affinity-0.52 eV0.661 eV
Density1850 kg/m³8860 kg/m³
Melting point1286.85 °C1494.85 °C
Boiling point2470.85 °C2926.85 °C
Discovery year17971735