Strontium vs Thallium

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PropertySr StrontiumTl Thallium
Atomic number3881
SymbolSrTl
NameStrontiumThallium
Categoryalkaline-earth-metalpost-transition-metal
Standard Atomic Weight87.62 u204.3835 u
Period56
Group213
Blocksp
Phase at STPsolidsolid
Electron configuration[Kr]5s2[Xe]6s24f145d106p1
Oxidation states[1, 2][-5, -2, -1, 1, 2, 3]
Electronegativity (Pauling)0.951.62
Electron affinity0.052 eV0.377 eV
Density2640 kg/m³1.180000e+4 kg/m³
Melting point776.85 °C303.85 °C
Boiling point1381.85 °C1472.85 °C
Discovery year17921861