• Name: Iridium

  • Symbol: Ir

  • Number of Energy Levels: 6

  • Electrons on the outer energy level: 2

  • Atomic Number: 77

  • Atomic Mass: 192.217 Amu

  • Protons / Electrons: 77

  • Neutrons: 115

  • Density: 22.5 g/cm3

  • Classification: Transition Metal

Top 18 interesting facts about Iridium

  • Iridium was discovered in 1804 by Smithson Tenant. Its name derives from the Latin word "iridis" which means "rainbow".
  • Iridium's melting point is at 2410.0 C (2683.15 K, 4370.0 F) and its boiling point is at 4527.0 C (4800.15 K, 8180.6 F).
  • Iridium is a hard, brittle, silver-white transition metal.
  • Iridium is the second densest element.
  • Iridium is the most corrosion resistant element.
  • Iridium has the 10th highest melting point among all chemical elements.
  • Iridium has the second highest modulus of elasticity (osmium has the highest).
  • Iridium is an expensive metal (more than $1000/oz).
  • Iridium dust is reactive and flammable.
  • Iridium is one of the rarest elements in Earth's crust.
  • Gold is 40 times more abundant than iridium.
  • Iridium is usually found in meteorites.
  • Iridium is found as an uncombined element or in natural alloys.
  • Iridium has two stable isotopes: 191-Ir and 193-Ir (the most abundant).
  • The largest reserves of iridium are in South Africa, Russia, and Canada.
  • Iridium is a byproduct of nickel and copper production.
  • Iridium is used for the following applications: compass bearings and balances production, aircraft engine parts, deep water pipes, hardening agent in platinum alloys, in computers memory, electrical contacts, as a source of gamma radiation in cancer treatment, in robotic spacecrafts, in X-ray optics, in the production of anti-protons, and other very niche applications.
  • Iridium in bulk form is not hazardous to human health but iridium powder is irritant and can ignite in the air.