iridium: Quick Facts

Written and fact-checked by

The Information Architects of Encyclopaedia Britannica

Facts

Also Known As	Ir

Photos

A periodic table element card for iridium shows its atomic number 77, symbol Ir, atomic weight 192.217, electron configuration, and name. The card indicates iridium is a solid, weakly basic transition metal with a face-centered cubic crystal structure. A color key and icon legend appear below.

See All Images and Interactives →

Topics

platinum–iridium rhodium chemical element transition metal hydrogen carbon sodium nitrogen sulfur phosphorus boron iodine fluorine zinc

Periodic Table of the elements concept image (chemistry)

Facts You Should Know: The Periodic Table Quiz

Concept artwork on the periodic table of elements.

118 Names and Symbols of the Periodic Table Quiz