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.

This page in German - Diese Seite in Deutsch
© 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
These recommendations are believed to be correct. However, no guarantee of their accuracy is given. Therefore, purchasers shall make their own tests to determine suitability for their use. These products are offered for industrial and related uses (e.g. research and development) only. However the user must take the necessary precautions appropriate for products containing chemicals. This description does not imply the absence of any patents, the responsibility whatsoever solely rests with the user.