Osmium
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Osmium is a chemical element, having the chemical symbol Os.
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Its atomic number (the number of protons) is 76. It has a Standard Atomic Weight of 190.23(3), and is typically found as a solid in its elemental form.
Osmium is considered to be a member of the "Transition metal" class of elements, has a boiling point of 5,012 °C , and a melting point of 3,033 °C .