Details : Item 215

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Alkali metals
Alkaline earth metal
Transition metals I
Transition metals II
Transition metals III
Transition metals IV
Post-transition metal
Metalloid
Diatomic non-metal
Noble gas
Other

Famille : Transition metals III/3
Osmium
Symbol: Os, phase: solid, silvery blue cast. The
densest naturally occurring element, with a density of
22.59 g/cm3. Used in the tips of fountain pens, electrical
contacts,as they can resist wear from frequent operation.
Properties
Atomic number76
Atomic weight190.23
Melting point (K)3306
Boiling point (K)5285
Speed of sound (m/s)4940
Discovery1803 (S. Tennant)