Strontium vs Rutherfordium

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PropertySr StrontiumRf Rutherfordium
Atomic number38104
SymbolSrRf
NameStrontiumRutherfordium
Categoryalkaline-earth-metaltransition-metal
Standard Atomic Weight87.62 u263 u
Period57
Group24
Blockss
Phase at STPsolidsolid
Electron configuration[Kr]5s2[Rn]7s25f146d2
Oxidation states[1, 2][3, 4]
Electronegativity (Pauling)0.95N/A
Electron affinity0.052 eV0.65 eV
Density2640 kg/m³2.330000e+4 kg/m³
Melting point776.85 °C2126.85 °C
Boiling point1381.85 °C5526.85 °C
Discovery year17921964