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Osmium is the densest naturally occurring element, with a density of .

Osmium forms compounds with oxidation states ranging from −2 to 8.

The lower oxidation states are stabilized by the larger halogens, so that the trichloride, tribromide, triiodide, and even diiodide are known.

The oxidation state 1 is known only for osmium iodide (Os I), whereas several carbonyl complexes of osmium, such as triosmium dodecacarbonyl ( In general, the lower oxidation states of osmium are stabilized by ligands that are good σ-donors (such as amines) and π-acceptors (heterocycles containing nitrogen).

Within Earth’s crust, osmium, like iridium, is found at highest concentrations in three types of geologic structure: igneous deposits (crustal intrusions from below), impact craters, and deposits reworked from one of the former structures.

The largest known primary reserves are in the Bushveld igneous complex in South Africa, The alluvial deposits used by pre-Columbian people in the Chocó Department, Colombia are still a source for platinum group metals.