Home 77 Ir Iridium back to the periodic table
 
Atomic number   77
Symbol   Ir
Atomic weight   192.22
Density [g/cm3]   22.65
Melting point [°C]   2410
Boiling point [°C]   4500
1st Ionization energy [eV]   9.1
Electronic configuration   [Xe] 4f14 5d7  6s2
Oxidation number (most stable)   6, 4, 3, 2, 1, 0, 1-
Atomic radius [pm]   135.7
Ionic radius [pm]   63 (4+)
Abundance in crustal rocks [ppm]   0.001
Origin of the name   (geek) irideios = rainbow colours, because of the different colours of the Ir compounds
Discovery   1804 by the English Smithson Tennant
Uses   because of brittleness only as alloy with Pt for laboratory crucible, thermocouples, etc.
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 © 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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