Home 76 Os Osmium back to the periodic table
 
Atomic number   76
Symbol   Os
Atomic weight   190.2
Density [g/cm3]   22.61
Melting point [°C]   3045
Boiling point [°C]   5030
1st Ionization energy [eV]   8.7
Electronic configuration   [Xe] 4f14 5d6  6s2
Oxidation number (most stable)   8, 6, 4, 3, 2, 0, 2-
Atomic radius [pm]   135
Ionic radius [pm]   63 (4+)
Abundance in crustal rocks [ppm]   0.005
Origin of the name   (greek) osme = smell (of the tetra oxide)
Discovery   1803 by the English Smithson Tennant
Uses   minor economical significance.
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 © 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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