The name iridium is appropriate, for its salts are highly coloured.
Iridium is white, similar to platinum, but with a slight yellowish cast.
It is very hard and brittle, making it very hard to machine, form, or work. 67.8 20.7 Electronegativities Both values are quoted on the Pauling scale. The following CrystalMaker image represents the solid state structure. For most elements, the most stable allotrope is illustrated. This section gives some data for naturally occurring isotopes.