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. The price of 99.95 % pure ruthenium sponge is 784.80 for 50 g.
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
6 Jan. 2020
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