 |
| Name |
osmium |
| Symbol |
Os |
| Atomic Weight |
190.23 |
| Atomic Number |
76 |
| CAS ID |
7440-04-2 |
| Group Number |
8 |
| Group Name |
Precious Metal |
| Period Number |
6 |
| Origin of Name |
Greek, osme = "smell." |
| Year Discovered |
1803 |
| Discovery Credits |
Discovered by S. Tennant at London, UK. |
| Class |
Metallic |
| Color |
Bluish Gray |
| Standard State |
Solid at 77 F & 298 K |
| Description |
Lustrous silvery metal of the platinum group. Unaffected by
air, water, and acids, but dissolves in molten alkalis. Smells, due to
formation of volatile OsO4. Used in alloys and catalysts. Diagnostic tests:
There are no simple chemical tests for osmium. The element is usually
found as an alloy or a sulfide mineral with other platinum group metals. Atomic Absorption
Spectroscopy is used for quantitative analysis and Energy Dispersive
Analysis of X-rays (EDAX) is used for qualitative analysis.
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