10. 
    ruthenium
    (Ru), chemical element, one of the platinum metals of Group VIII of the periodic table, used as an alloying agent to harden platinum and palladium. ... [5 related articles]
    Found op http://www.britannica.com/eb/a-z/r/81
    
    
11. 
    Ruthenium
    Ruthenium (m {respell|roo|THEE|nee-əm}) is a chemical element with symbol Ru and atomic number 44. It is a rare transition metal belonging to the platinum group of the periodic table. Like the other metals of the platinum group, ruthenium is inert to most chemicals. The Russian scientist Karl Erns...
    Found op http://en.wikipedia.org/wiki/Ruthenium
    
    
12. 
    ruthenium
    (Ru) A silvery-white, metallic element belonging to the platinum group of transition elements. Ruthenium was first discovered by Jedrzej A. Sniadecki in Vilno, Poland, in 1808, and then rediscovered By G. W. Osann in Tartu, Russia, in 1828; its name comes from Ruthenia, the Lati...
    Found op http://www.daviddarling.info/encyclopedia/R/ruthenium.html
    
    
13. 
    ruthenium
    ruthenium (rOOthē'nēum) , metallic chemical element; symbol Ru; at. no. 44; at. wt. 101.07; m.p. about 2,310°C; b.p. about 3,900°C; sp. gr. 12.41 at 20°C; valence commonly +2, +3, +4, +6, or +8. Ruthenium is a hard, lustrous, silver-gray metal with a close-packed hexagona...
    Found op http://www.infoplease.com/ce6/sci/A0842760.html
    
    
14. 
    Ruthenium
    Ruthenium is a metal element of the platinum group of elements, occurring in the Urals and Americas. It is a hard, brittle, grey metal that forms ruthenious and ruthenic salts, of a reddish brown colour, of which ruthenious chloride gives a characteristic fine black precipitate with water.
    Found op http://www.probertencyclopaedia.com/browse/GR.HTM
    
    
15. 
    ruthenium
    (Ru) Type: Term Pronunciation: rū-thē′nē-ŭm Definitions: 1. A metallic element of the platinum group; atomic no. 44, atomic wt. 101.07; 106Ru, with a half-life of 1.020 years, has been used in the treatment of certain eye problems.
    Found op http://www.medilexicon.com/medicaldictionary.php?t=79230
    
    
16. 
    ruthenium
    Hard, brittle, silver-white, metallic element, atomic number 44, relative atomic mass 101.07. It is one of the so-called platinum group of metals; it occurs in platinum ores as a free metal and in the natural alloy osmiridium. It is used as a hardener in alloys and as a catalyst; its compounds are u...
    Found op http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0010150.html
    
    
17. 
    ruthenium
    1) Atomic number 44 2) Metal 3) Metal element with the symbol ru 4) Metallic element 5) Ru
    Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/ruthenium/1
    
    

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