Iridium is a dense platinum-group metal with outstanding corrosion resistance and uses in harsh, high-temperature environments.
Atomic number
77
Category
Transition metal
Period
6
Group
9
State
Solid
Fun facts about Iridium
It resists attack by most acids and molten materials.
An iridium-rich geological layer marks the impact associated with the end-Cretaceous extinction.
Iridium crucibles can contain aggressive molten oxides.
Common uses of Iridium
Spark-plug electrodes
High-temperature crucibles
Specialised catalysts
Where Iridium sits in the periodic table
Iridium is classified as a transition metal in period 6 and group 9 of the periodic table. Under the conditions represented in this reference, its state is solid.
Quick chemistry revision
For quick revision, pair the symbol Ir with atomic number 77 and the listed atomic mass 192.22. The summary, facts, and uses above keep those element properties together in one reference.