Chromium vs Rutherfordium

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PropertyCr ChromiumRf Rutherfordium
Atomic number24104
SymbolCrRf
NameChromiumRutherfordium
Categorytransition-metaltransition-metal
Standard Atomic Weight51.9961 u263 u
Period47
Group64
Blockss
Phase at STPsolidsolid
Electron configuration[Ar]3d54s1[Rn]7s25f146d2
Oxidation states[-4, -2, -1, 0, 1, 2, 3, 4, 5, 6][3, 4]
Electronegativity (Pauling)1.66N/A
Electron affinity0.675 eV0.65 eV
Density7150 kg/m³2.330000e+4 kg/m³
Melting point1906.85 °C2126.85 °C
Boiling point2670.85 °C5526.85 °C
Discovery year17971964