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.