Osmium

<p>Osmium  is a <a href="/facts/Chemical_element/0jducgWD">chemical element</a>; it has <a href="/facts/Symbol_(chemistry)/2Fe1VAL0">symbol</a> Os and <a href="/facts/Atomic_number/bgAr581S">atomic number</a> 76. It is a hard, brittle, bluish-white <a href="/facts/Transition_metal/0slGWoLQ">transition metal</a> in the <a href="/facts/Platinum_group/pbDgst54">platinum group</a> that is found as a <a href="/facts/Abundance_of_elements_in_Earth%2527s_crust/UDSVHH56">trace element</a> in alloys, mostly in <a href="/facts/Platinum/qJC6lQf7">platinum</a> ores. Osmium has the highest <a href="/facts/Density/92p6hh9I">density</a> of any stable element (22.59 g/cm3). It is also one of the <a href="/facts/Abundance_of_elements_in_Earth%2527s_crust/UDSVHH56">rarest elements</a> in the Earth's crust, with an estimated abundance of 50 parts per trillion (<a href="/facts/Parts-per_notation/PozRuoLM">ppt</a>). Manufacturers use <a href="/facts/Alloy/I7w7WQWR">alloys</a> of osmium with platinum, <a href="/facts/Iridium/cB4n6MbQ">iridium</a>, and other platinum-group metals for <a href="/facts/Fountain_pen/p2cmesjV">fountain pen</a> <a href="/facts/Nib_(pen)/VFKkkDEW">nib tipping</a>, <a href="/facts/Electrical_contacts/eELyUxrd">electrical contacts</a>, and other applications that require extreme durability and <a href="/facts/Hardness/PtGn6E20">hardness</a>. 
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Osmium open-in-new

Osmium