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20 hours ago · Iridium is a chemical element; it has symbol Ir and atomic number 77. A very hard, brittle, silvery-white transition metal of the platinum group, it is considered the second-densest naturally occurring metal (after osmium) with a density of 22.56 g/cm 3 (0.815 lb/cu in) [8] as defined by experimental X-ray crystallography. [a] 191 Ir and 193 Ir ...
- Iridium (Disambiguation)
Iridium is a chemical element with symbol Ir and atomic...
- Smithson Tennant
The blue plaque for Smithson Tennant in Finkle Street,...
- Eltanin Impact
The possible impact site is located at the edge of the...
- Cretaceous–Paleogene Boundary
Badlands near Drumheller, Alberta, Canada, where glacial and...
- Iridium (Disambiguation)
