ASCII PERIODIC TABLE OF THE ELEMENTS
Ru
Relative atomic mass: 101.07 +- 0.02
English: Ruthenium
French: Ruthenium
Croatian: Rutenij
German: Ruthenium
Italian: Rutenio
Spanish: Rutenio
Atomic number: 44
Group numbers: 8
Period: 5
Standard state (20 oC): solid
Discovery: 1844 Karl Karlovich Klaus (RU)
Ruthenium was discovered by Karl Karlovich Klaus (RU) in 1844. The origin of the name comes from the Latin word 'Ruthenia' meaning 'Russia'. It is a rare, extremely brittle, silver-grey metal. Ruthenium is unaffected by air, water or acids but reacts with very hot (molten) alkalis. Ruthenium is found in pentlandite and pyroxinite. It is used to harden platinum and palladium, aircraft magnetos use platinum alloy with 10% ruthenium.
Electronic configuration: [Kr] 4d7 5s1
Formal oxidation number: +3
Atomic radius: 132.5 pm
Electronegativities: 2.2
Thermal conductivity: 117 W/(m K)
Electrical resistivity (20 oC): 7.6 microOhm cm
Melting point: 2334 oC
Boiling point: 4150 oC
Heat of fusion: 23.7 kJ/mol
Heat of vaporization: 567 kJ/mol
Heat of atomization: 641.031 kJ/mol
43Tc <= 44Ru => 45Rh
ASCII Periodic Table of the Elements
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30 Oct. 2010
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