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The density of osmium is slightly greater than that of iridium; the two are so similar (22.587 versus 22.562 g/cm 3 at 20 °C) that each was at one time considered to be the densest element. Only in the 1990s were measurements made accurately enough (by means of X-ray crystallography ) to be certain that osmium is the denser of the two.
— "Values ranging from 21.3 to 21.5 gm/cm 3 at 20 °C have been reported for the density of ... 76 Os osmium; use: 20 g ... refer to "at the melting point (m.p ...
The hardness of osmium is moderately high at 4 GPa. Because of its hardness, brittleness, low vapor pressure (the lowest of the platinum-group metals), and very high melting point (the fourth highest of all elements, after carbon, tungsten, and rhenium), solid osmium is difficult to machine, form, or work.
Most definitions of the term 'refractory metals' list the extraordinarily high melting point as a key requirement for inclusion. By one definition, a melting point above 4,000 °F (2,200 °C) is necessary to qualify, which includes iridium, osmium, niobium, molybdenum, tantalum, tungsten, rhenium, rhodium, ruthenium and hafnium. [2]
Osmiridium-564562. Osmiridium and iridosmine are natural alloys of the elements osmium and iridium, with traces of other platinum-group metals.. Osmiridium has been defined as containing a higher proportion of iridium, with iridosmine containing more osmium.
Atomic number (Z): 76: Group: group 8: Period: period 6: Block d-block Electron configuration [] 4f 14 5d 6 6sElectrons per shell: 2, 8, 18, 32, 14, 2: Physical ...
The Gmelin rare earths handbook lists 1522 °C and 1550 °C as two melting points given in the literature, the most recent reference [Handbook on the chemistry and physics of rare earths, vol.12 (1989)] is given with 1529 °C.
Density: 4.38 g/cm 3: Melting point: 450 °C (842 °F; 723 K) ... chloride or osmium dichloride is an inorganic compound composed of osmium metal and chlorine with ...