Osmium

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Osmium
190.23(3)



  Os
76
1s22s22p63s23p63d104s24p6 4d105s25p64f145d66s2
[ ? ] Transition metal:
Properties:
Lustrous, bluish-white, extremely hard and brittle metal.
Hazard:
Finely divided metal is pyrophoric and may ignite spontaneously in air.


Osmium is a chemical element, having the chemical symbol Os. Its atomic number (the number of protons) is 76. It has a standard atomic weight of 190.23 g•mol −1 and is a solid in its elemental form. Osmium is extremely dense--see benchmark quantities for a comparison.

Osmium is considered a member of the "Transition metal" class of elements. At a pressure of 101.325 kPa, it has a boiling point of 5,012 °C and a melting point of 3,033 °C.

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