Osmium sixth cycle is the periodic table Ⅷ elements, the family member of platinum group metals. Symbol for the Os, atomic number 76, atomic weight of 190.2. Heavy platinum group metals, is one of the largest metal known density.
Osmium exist in osmiridium ore. Will contain the osmium solid roasting in the air, the volatilization of osmium tetroxide by using alcohol absorption, alkali solution after osmic acid salt with hydrogen reduction made osmium metal. Can be used to manufacture high hardness of the alloy. Osmium with rhodium, ruthenium, iridium, or platinum alloy, commonly used as a record player, fountain pen, and bearing in clocks and watches.
Osmium metal elemental medium density is known, its density is 22.59 g/cm3, melting point 3045 ℃, boiling point at above 5300 ℃. The six-party dense lattice. Grey metallic blue, qualitative hard and brittle, in iron dao in a mortar, can easily become powder, osmium powder is blue-black, and osmium metal powder can be spontaneous combustion.
Warm reminder: osmium vapor to be toxic will strongly stimulate the eye mucous membrane, serious can cause blindness.
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