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.

This page in German - Diese Seite in Deutsch
© 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
These recommendations are believed to be correct. However, no guarantee of their accuracy is given. Therefore, purchasers shall make their own tests to determine suitability for their use. These products are offered for industrial and related uses (e.g. research and development) only. However the user must take the necessary precautions appropriate for products containing chemicals. This description does not imply the absence of any patents, the responsibility whatsoever solely rests with the user.