 |
| Name |
iridium |
| Symbol |
Ir |
| Atomic Weight |
192.217 |
| Atomic Number |
77 |
| CAS ID |
7439-88-5 |
| Group Number |
9 |
| Group Name |
Precious Metal |
| Period Number |
6 |
| Origin of Name |
Latin, Iris = "rainbow." |
| Year Discovered |
1803 |
| Discovery Credits |
Discovered by S. Tennant at London, UK. |
| Class |
Metallic |
| Color |
Silvery White |
| Standard State |
Solid at 77 F & 298 K |
| Description |
Hard, lustrous, silvery metal of the platinum group. Stable
to air and water, inert to all acids, but fused NaOH will attack it. Used
in special alloys and spark plugs. Diagnostic tests:
There are no simple chemical tests for iridium. 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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