It is a hard, brittle, bluish-white transition metal in the platinum group that is found as a trace element in alloys, mostly in platinum ores.
Osmium is the densest naturally occurring element, with a density of .
Its alloys with platinum, iridium, and other platinum-group metals are employed in fountain pen nib tipping, electrical contacts, and other applications where extreme durability and hardness are needed.
Because of its hardness, brittleness, low vapor pressure (the lowest of the platinum-group metals), and very high melting point (the fourth highest of all elements, after only carbon, tungsten, and rhenium), solid osmium is difficult to machine, form, or work.
By April 2013, Whedon had completed a draft of the script, and casting began in June with the re-signing of Downey.
Second unit filming began in February 2014 in South Africa with principal photography taking place between March and August 2014.
The sequel was announced in May 2012, after the successful release of The Avengers.
Osmium (from Greek ὀσμή osme, "smell") is a chemical element with symbol Os and atomic number 76.
The 8 oxidation state is notable for being the highest attained by any chemical element aside from iridium's 9 The most common compound exhibiting the 8 oxidation state is osmium tetroxide.
This toxic compound is formed when powdered osmium is exposed to air.
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