Details : Item 215

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

Famille : Transition metals III/3
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.
Atomic number76
Atomic weight190.23
Melting point (K)3306
Boiling point (K)5285
Speed of sound (m/s)4940
Discovery1803 (S. Tennant)