Iridium

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A small foil of Iridium

Iridium is the 77th element on the periodic table. Its symbol is Ir. Ir's atomic number(the amount of protons) is 77.

Iridium is a metal. It is very hard to find and costs a lot. It is known as a "noble metal". Iridium belongs to a group of metals known as transition metals. It looks like platinum and is found in asteroids and comets. It can be used to find out when an asteroid or comet will hit the Earth. It is a very costly metal that can fold and bend just like aluminum. It is very shiny. It is relatively rare on the Earth's crust. Most Iridium is found in Brazil, Canada, Myanmar, Russia, South Africa, and the United States. Iridium is the most corrosion resistant metal. Iridium melts at 2410 °C and boils at 4130 °C.

Iridium is not needed in the body.

A man named Smithson Tennant first found it in the year 1803. Smithson Tennant found it in the remains when he left crude platinum in a mixture of hydrochloric acid and nitric acid.