Hydrogen vs Ruthenium

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PropertyH HydrogenRu Ruthenium
Atomic number144
SymbolHRu
NameHydrogenRuthenium
Categorynonmetaltransition-metal
Standard Atomic Weight1.007975 u101.07 u
Period15
Group18
Blockss
Phase at STPgassolid
Electron configuration1s1[Kr]5s14d7
Oxidation states[-1, 1][-4, -2, 1, 2, 3, 4, 5, 6, 7, 8]
Electronegativity (Pauling)2.22.2
Electron affinity0.75419 eV1.05 eV
Density0.08988 kg/m³1.210000e+4 kg/m³
Melting point-259.34 °C2333.85 °C
Boiling point-252.87 °C4149.85 °C
Discovery year17661828