Strontium vs Radon

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PropertySr StrontiumRn Radon
Atomic number3886
SymbolSrRn
NameStrontiumRadon
Categoryalkaline-earth-metalnoble-gas
Standard Atomic Weight87.62 u222 u
Period56
Group218
Blocksp
Phase at STPsolidgas
Electron configuration[Kr]5s2[Xe]6s24f145d106p6
Oxidation states[1, 2][0, 2, 6]
Electronegativity (Pauling)0.95N/A
Electron affinity0.052 eV-0.7 eV
Density2640 kg/m³9.73 kg/m³
Melting point776.85 °C-71.15 °C
Boiling point1381.85 °C-61.7 °C
Discovery year17921900