Osmium
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Osmium is a chemical element; it has symbol Os and atomic number 76. It is a hard, brittle, bluish-white transition metal in the platinum group. It was discovered in 1803 by Smithson Tennant, who name
Osmium crystals
Osmium, remelted pellet
Osmium tetroxide (OsO4)
Native platinum containing traces of the other platinum group metals
Rhenium
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Rhenium is a chemical element; it has symbol Re and atomic number 75. It is a silvery-gray, heavy, third-row transition metal in group 7 of the periodic table. With an estimated average concentration
Osmium
…vapor pressure (the lowest of the platinum-group metals), and very high melting point (the fourth highest of all elements, after carbon, tungsten, and rhenium), solid osmium is difficult to machine, form, or work. Osmium forms compounds with oxidation states ranging from −2 to +8. The most common oxidation…
Rhenium single crystal bar and 1cm 3 cube
Molybdenite
Ammonium perrhenate
The Pratt & Whitney F-100 engine uses rhenium-containing second-generation superalloys