Strontium vs Ruthenium

← Back to Periodic Table
PropertySr StrontiumRu Ruthenium
Atomic number3844
SymbolSrRu
NameStrontiumRuthenium
Categoryalkaline-earth-metaltransition-metal
Standard Atomic Weight87.62 u101.07 u
Period55
Group28
Blockss
Phase at STPsolidsolid
Electron configuration[Kr]5s2[Kr]5s14d7
Oxidation states[1, 2][-4, -2, 1, 2, 3, 4, 5, 6, 7, 8]
Electronegativity (Pauling)0.952.2
Electron affinity0.052 eV1.05 eV
Density2640 kg/m³1.210000e+4 kg/m³
Melting point776.85 °C2333.85 °C
Boiling point1381.85 °C4149.85 °C
Discovery year17921828