Osmium
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Osmium is a chemical element. It is is element number 76 on the periodic table. Its symbol is Os.
There is not much osmium on earth. There is actually such a small amount that osmium is very expensive.
Osmium is a metal and it does not react very much, and such a metal is known as a "noble metal".
It was discovered in 1804 by Smithson Tennant. He found it together with Iridium in a bit of Platinum, which he had dissolved in Aqua regia.