Difference between revisions of "Iridium"
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| − | {{Element | name=Iridium | symbol=Ir | anumber=77 | amass=192.22 amu | state=Solid | class=Transition Metals | cstructure=Face-Centered Cubic| color=Silver | date=1803 | discname=Smithson Tennant | origname=From the Latin ''iridis'', meaning ''rainbow''. | uses=Used in conjunction with [[osmium]] to tip gold pen points, to make crucibles and other high-temperature containers. Also used to make alloys for standard weights and measures, as well as heat-resistant alloys. In addition, used in cancer irradiation, hypodermic needles, helicopter spark plugs and as hardening agent for [[platinum]]. | obtained=Found in gravel deposits with [[platinum]], [[iridosmium]], and [[osmiridium]] ores. }} | + | {{Element | name=Iridium | symbol=Ir | anumber=77 | amass=192.22 amu | state=Solid | class=Transition Metals | cstructure=Face-Centered Cubic| density=22.560 g/cm^3 | color=Silver, slightly yellowish | date=1803 | discname=Smithson Tennant | origname=From the Latin ''iridis'', meaning ''rainbow''. | uses=Used in conjunction with [[osmium]] to tip gold pen points, to make crucibles and other high-temperature containers. Also used to make alloys for standard weights and measures, as well as heat-resistant alloys. In addition, used in cancer irradiation, hypodermic needles, helicopter spark plugs and as hardening agent for [[platinum]]. | obtained=Found in gravel deposits with [[platinum]], [[iridosmium]], and [[osmiridium]] ores. }} |
| − | '''Iridium''' is an [[element]] in the [[transition metal]]s class of the [[periodic table of the elements|periodic table]]. It is hard and lustrous, and | + | '''Iridium''' is an [[element]] in the [[transition metal]]s class of the [[periodic table of the elements|periodic table]]. It is hard and lustrous, and is perhaps the most corrosion-resistant metal known. It has the second-highest density of all elements, after [[osmium]]. It has two stable isotopes. |
| + | |||
| + | An alloy of [[platinum]] and iridium was used in the international standard [[meter]] bar, before the standard was changed in 1960. A similar alloy is still used in the international standard [[kilogram]]. | ||
[[Category:Elements]] | [[Category:Elements]] | ||
Revision as of 00:24, November 27, 2008
| Iridium | |
|---|---|
| Properties | |
| Atomic symbol | Ir |
| Atomic number | 77 |
| Classification | Transition Metals |
| Atomic mass | 192.22 amu |
| Density (grams per cc) | 22.560 g/cm^3 |
| Other Information | |
| Date of discovery | 1803 |
| Name of discoverer | Smithson Tennant |
| Name origin | From the Latin iridis, meaning rainbow. |
| Uses | Used in conjunction with osmium to tip gold pen points, to make crucibles and other high-temperature containers. Also used to make alloys for standard weights and measures, as well as heat-resistant alloys. In addition, used in cancer irradiation, hypodermic needles, helicopter spark plugs and as hardening agent for platinum. |
| Obtained from | Found in gravel deposits with platinum, iridosmium, and osmiridium ores. |
Iridium is an element in the transition metals class of the periodic table. It is hard and lustrous, and is perhaps the most corrosion-resistant metal known. It has the second-highest density of all elements, after osmium. It has two stable isotopes.
An alloy of platinum and iridium was used in the international standard meter bar, before the standard was changed in 1960. A similar alloy is still used in the international standard kilogram.