- A chemical element whose atomic number is 76. It is a bluish-white lustrous metal which is very hard, and whose density is approximately 22.61, which makes it, along with iridium, one of the two most dense elements. In addition, it is the most corrosion-resistant element, and has over 35 know isotopes, of which 5 are stable. Its applications include its use in hard alloys, and in instrument bearings. Its chemical symbol is Os.
- chemical symbol Os
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