Ruthenium - Periodic Table of the Elements

FACULTY OF CHEMICAL TECHNOLOGY IN SPLIT
PERIODIC TABLE OF THE ELEMENTS version 1.7


 Ru

English:  Ruthenium
French: Ruthénium
Croatian: Rutenij
German: Ruthenium
Italian: Rutenio


Atomic number: 44
Group numbers: 8
Period: 5
Standard state (20 °C): solid

Ruthenium was discovered by Karl Karlovich Klaus (Russia) in 1844. The origin of the name comes from the Latin word Ruthenia meaning Russia. It is rare, extremely brittle, silver-grey metal. Unaffected by air, water or acids. Reacts with very hot (molten) alkalis.

Electronic configuration: [Kr] 4d⁷ 5s¹
Relative atomic mass: 101.07(2)
Formal oxidation number: +3

Electronegativities: 2.2
Thermal conductivity: 117 W/(m K)
Electrical resistivity (20 °C): 7.6 μΩcm

Atomic radius: 132.5 pm
Density (g/dm3): 12370 (293 K) 
10900 (m.p.)
Molar volume (cm3/mol): 8.17 (293 K) 
9.27 (m.p.)

Melting point: 2334 °C
Boiling point: 4150 °C
Critical temperature: 9327 °C

Heat of fusion: 23.7 kJ/mol
Heat of vaporization: 567 kJ/mol
Heat of atomization: 641.031 kJ/mol

Ruthenium is found in pentlandite and pyroxinite. 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. 43Tc <= 44Ru => 45Rh ___________________ If you have comments, corrections or suggestions about this site, please send me a e-mail. Periodic Table of the Elements __________________________________ Last modified: 29.03.2003 Copyright © 1998-2003 by Eni Generalic