Ruthenium
Symbol: Ru
Atomic Number: 44
Atomic Weight: 101.07
Boiling Point: 4425 K
Melting Point: 2610 K
Density at 300K: 12.37 g/cm3
Covalent radius: 1.25
Atomic radius: 1.89
Atomic volume: 8.30 cm3/mol
First ionization potental: 7.37 V
Specific heat capacity: 0.238 Jg-1K-1
Thermal conductivity: 117 Wm-1K-1
Electrical conductivity: 14.9 106Ω-1m-1
Heat of fusion: 25.52 kJ/mol
Heat of vaporization: 567.77 kJ/mol
Electronegativity: 2.2 (Pauling's)

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Ru*the"ni*um (?), n. [NL. So named from the Ruthenians, a Little Russian people, as coming from Russia, the metal having been found in the Ural mountains.] Chem.

A rare element of the light platinum group, found associated with platinum ores, and isolated as a hard, brittle steel-gray metal which is very infusible. Symbol Ru. Atomic weight 103.5. Specific gravity 12.26. See Platinum metals, under Platinum.

 

© Webster 1913.

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