Iridium - Periodic Table of Videos
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The team at periodicvideos has created a TED-Ed Lesson for every element of the periodic table. Iridium is element 77 and its symbol is Ir.
Due to its resistance to wear, an alloy of iridium and osmium was used in fountain pen nibs and, as a school boy, the professor used such a pen to write all of his high-school exams!