osmium

element 76

Osmium

chemical element with symbol Os and atomic number 76

Osmium crystals.jpg

Os

Chemical element with atomic number 76 (Os)

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Osmium is a chemical element; it has symbol Os and atomic number 76. It is a hard, brittle, bluish-white transition metal in the platinum group. Osmium has the highest density of any stable element and one of the lowest abundances in the Earth's crust. Manufacturers use alloys of osmium with platinum, iridium, and other platinum-group metals for fountain pen nib tipping, electrical contacts, and other applications that require extreme durability and hardness.

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Osmium

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