Iridium


 * Element name:** Iridium


 * Element symbol:** Ir


 * Atomic mass:** 192[[image:iridium.jpg width="216" height="288" align="right"]]


 * Atomic number:** 77


 * Protons:** 77


 * Electrons:** 77


 * Discovery:** 1803 by Smithson Tennant


 * How it was named:** For goddess Iris, personification of the rainbow


 * State of matter:** Solid


 * Melting point:** 2466°C


 * Boiling point:** 4428°C


 * Characteristics:**
 * silvery white
 * 11 elements
 * it weighs 2256 pounds


 * Uses:**


 * Interesting facts:** It is the only metal to maintain good mechahical properties in the air at temperatures above 1600°C. It caused extinction of dinosaurs and many other species.

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